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class="vector-toc-numb">2</span> <span>General principles</span> </div> </a> <ul id="toc-General_principles-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Dates" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Dates"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Dates</span> </div> </a> <button aria-controls="toc-Dates-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Dates subsection</span> </button> <ul id="toc-Dates-sublist" class="vector-toc-list"> <li id="toc-Years" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Years"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Years</span> </div> </a> <ul id="toc-Years-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Calendar_dates" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Calendar_dates"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Calendar dates</span> </div> </a> <ul id="toc-Calendar_dates-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Week_dates" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Week_dates"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Week dates</span> </div> </a> <ul id="toc-Week_dates-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Ordinal_dates" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Ordinal_dates"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4</span> <span>Ordinal dates</span> </div> </a> <ul id="toc-Ordinal_dates-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Times" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Times"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Times</span> </div> </a> <button aria-controls="toc-Times-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Times subsection</span> </button> <ul id="toc-Times-sublist" class="vector-toc-list"> <li id="toc-Time_zone_designators" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Time_zone_designators"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Time zone designators</span> </div> </a> <ul id="toc-Time_zone_designators-sublist" class="vector-toc-list"> <li id="toc-Local_time_(unqualified)" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Local_time_(unqualified)"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.1</span> <span>Local time (unqualified)</span> </div> </a> <ul id="toc-Local_time_(unqualified)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Coordinated_Universal_Time_(UTC)" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Coordinated_Universal_Time_(UTC)"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.2</span> <span>Coordinated Universal Time (UTC)</span> </div> </a> <ul id="toc-Coordinated_Universal_Time_(UTC)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Time_offsets_from_UTC" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Time_offsets_from_UTC"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.3</span> <span>Time offsets from UTC</span> </div> </a> <ul id="toc-Time_offsets_from_UTC-sublist" class="vector-toc-list"> <li id="toc-Additional_examples" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Additional_examples"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.3.1</span> <span>Additional examples</span> </div> </a> <ul id="toc-Additional_examples-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other_time_offset_specifications" class="vector-toc-list-item vector-toc-level-4"> <a class="vector-toc-link" href="#Other_time_offset_specifications"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1.3.2</span> <span>Other time offset specifications</span> </div> </a> <ul id="toc-Other_time_offset_specifications-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </li> </ul> </li> <li id="toc-Combined_date_and_time_representations" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Combined_date_and_time_representations"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Combined date and time representations</span> </div> </a> <ul id="toc-Combined_date_and_time_representations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Durations" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Durations"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Durations</span> </div> </a> <ul id="toc-Durations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Time_intervals" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Time_intervals"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Time intervals</span> </div> </a> <button aria-controls="toc-Time_intervals-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Time intervals subsection</span> </button> <ul id="toc-Time_intervals-sublist" class="vector-toc-list"> <li id="toc-Repeating_intervals" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Repeating_intervals"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Repeating intervals</span> </div> </a> <ul id="toc-Repeating_intervals-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Truncated_representations_(deprecated)" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Truncated_representations_(deprecated)"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Truncated representations (deprecated)</span> </div> </a> <ul id="toc-Truncated_representations_(deprecated)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Standardised_extensions" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Standardised_extensions"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Standardised extensions</span> </div> </a> <ul id="toc-Standardised_extensions-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Usage" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Usage"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>Usage</span> </div> </a> <button aria-controls="toc-Usage-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Usage subsection</span> </button> <ul id="toc-Usage-sublist" class="vector-toc-list"> <li id="toc-Commerce" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Commerce"> <div class="vector-toc-text"> <span class="vector-toc-numb">10.1</span> <span>Commerce</span> </div> </a> <ul id="toc-Commerce-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-RFCs" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#RFCs"> <div class="vector-toc-text"> <span class="vector-toc-numb">10.2</span> <span>RFCs</span> </div> </a> <ul id="toc-RFCs-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Adoption_as_national_standards" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Adoption_as_national_standards"> <div class="vector-toc-text"> <span class="vector-toc-numb">10.3</span> <span>Adoption as national standards</span> </div> </a> <ul id="toc-Adoption_as_national_standards-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes_and_references" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Notes_and_references"> <div class="vector-toc-text"> <span class="vector-toc-numb">12</span> <span>Notes and references</span> </div> </a> <ul id="toc-Notes_and_references-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">13</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">ISO 8601</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 48 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-48" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">48 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Afrikaans" lang="af" hreflang="af" data-title="ISO 8601" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A3%D9%8A%D8%B2%D9%88_8601" title="أيزو 8601 – Arabic" lang="ar" hreflang="ar" data-title="أيزو 8601" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%86%E0%A6%87%E0%A6%8F%E0%A6%B8%E0%A6%93_%E0%A7%AE%E0%A7%AC%E0%A7%A6%E0%A7%A7" title="আইএসও ৮৬০১ – Bangla" lang="bn" hreflang="bn" data-title="আইএসও ৮৬০১" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-zh-min-nan mw-list-item"><a href="https://zh-min-nan.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Minnan" lang="nan" hreflang="nan" data-title="ISO 8601" data-language-autonym="閩南語 / Bân-lâm-gú" data-language-local-name="Minnan" class="interlanguage-link-target"><span>閩南語 / Bân-lâm-gú</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Bulgarian" lang="bg" hreflang="bg" data-title="ISO 8601" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Breton" lang="br" hreflang="br" data-title="ISO 8601" data-language-autonym="Brezhoneg" data-language-local-name="Breton" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Catalan" lang="ca" hreflang="ca" data-title="ISO 8601" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Czech" lang="cs" hreflang="cs" data-title="ISO 8601" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Danish" lang="da" hreflang="da" data-title="ISO 8601" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – German" lang="de" hreflang="de" data-title="ISO 8601" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Estonian" lang="et" hreflang="et" data-title="ISO 8601" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Spanish" lang="es" hreflang="es" data-title="ISO 8601" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Esperanto" lang="eo" hreflang="eo" data-title="ISO 8601" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Basque" lang="eu" hreflang="eu" data-title="ISO 8601" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%DB%8C%D8%B2%D9%88_%DB%B8%DB%B6%DB%B0%DB%B1" title="ایزو ۸۶۰۱ – Persian" lang="fa" hreflang="fa" data-title="ایزو ۸۶۰۱" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fo mw-list-item"><a href="https://fo.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Faroese" lang="fo" hreflang="fo" data-title="ISO 8601" data-language-autonym="Føroyskt" data-language-local-name="Faroese" class="interlanguage-link-target"><span>Føroyskt</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – French" lang="fr" hreflang="fr" data-title="ISO 8601" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Korean" lang="ko" hreflang="ko" data-title="ISO 8601" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Croatian" lang="hr" hreflang="hr" data-title="ISO 8601" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Indonesian" lang="id" hreflang="id" data-title="ISO 8601" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Icelandic" lang="is" hreflang="is" data-title="ISO 8601" data-language-autonym="Íslenska" data-language-local-name="Icelandic" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Italian" lang="it" hreflang="it" data-title="ISO 8601" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Georgian" lang="ka" hreflang="ka" data-title="ISO 8601" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Swahili" lang="sw" hreflang="sw" data-title="ISO 8601" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target"><span>Kiswahili</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Latvian" lang="lv" hreflang="lv" data-title="ISO 8601" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Hungarian" lang="hu" hreflang="hu" data-title="ISO 8601" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%90.%E0%B4%8E%E0%B4%B8%E0%B5%8D.%E0%B4%92._8601" title="ഐ.എസ്.ഒ. 8601 – Malayalam" lang="ml" hreflang="ml" data-title="ഐ.എസ്.ഒ. 8601" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-xmf mw-list-item"><a href="https://xmf.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Mingrelian" lang="xmf" hreflang="xmf" data-title="ISO 8601" data-language-autonym="მარგალური" data-language-local-name="Mingrelian" class="interlanguage-link-target"><span>მარგალური</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Malay" lang="ms" hreflang="ms" data-title="ISO 8601" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Dutch" lang="nl" hreflang="nl" data-title="ISO 8601" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Japanese" lang="ja" hreflang="ja" data-title="ISO 8601" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="ISO 8601" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="ISO 8601" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Polish" lang="pl" hreflang="pl" data-title="ISO 8601" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Portuguese" lang="pt" hreflang="pt" data-title="ISO 8601" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Russian" lang="ru" hreflang="ru" data-title="ISO 8601" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Albanian" lang="sq" hreflang="sq" data-title="ISO 8601" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Simple English" lang="en-simple" hreflang="en-simple" data-title="ISO 8601" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Slovak" lang="sk" hreflang="sk" data-title="ISO 8601" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Slovenian" lang="sl" hreflang="sl" data-title="ISO 8601" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Finnish" lang="fi" hreflang="fi" data-title="ISO 8601" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Swedish" lang="sv" hreflang="sv" data-title="ISO 8601" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Thai" lang="th" hreflang="th" data-title="ISO 8601" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Turkish" lang="tr" hreflang="tr" data-title="ISO 8601" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/ISO_8601" title="ISO 8601 – Ukrainian" lang="uk" hreflang="uk" data-title="ISO 8601" 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id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">International standards for dates and times</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><caption class="infobox-title">Current date and time expressed according to ISO 8601 <small>[<span class="noprint plainlinks purgelink"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=ISO_8601&action=purge"><span title="Purge this page">refresh</span></a></span>]</small></caption><tbody><tr><th scope="row" class="infobox-label">Date</th><td class="infobox-data">2024-12-01</td></tr><tr><th scope="row" class="infobox-label">Time in <a href="/wiki/UTC" class="mw-redirect" title="UTC">UTC</a></th><td class="infobox-data">00:52:49Z<br />T005249Z</td></tr><tr><th scope="row" class="infobox-label">Date and time in <a href="/wiki/UTC" class="mw-redirect" title="UTC">UTC</a></th><td class="infobox-data">2024-12-01T00:52:49Z<br />20241201T005249Z</td></tr><tr><th scope="row" class="infobox-label">Date and time with the offset</th><td class="infobox-data">2024-11-30T12:52:49−12:00 <a href="/wiki/UTC%E2%88%9212:00" title="UTC−12:00">UTC−12:00</a> <span class="plainlinks" style="font-size:85%;">[<a class="external text" href="https://en.wikipedia.org/w/index.php?title=ISO_8601&action=purge">refresh</a>]</span><br /> <p>2024-12-01T00:52:49+00:00 <a href="/wiki/UTC%2B00:00" title="UTC+00:00">UTC+00:00</a> <span class="plainlinks" style="font-size:85%;">[<a class="external text" href="https://en.wikipedia.org/w/index.php?title=ISO_8601&action=purge">refresh</a>]</span><br /> </p> 2024-12-01T12:52:49+12:00 <a href="/wiki/UTC%2B12:00" title="UTC+12:00">UTC+12:00</a> <span class="plainlinks" style="font-size:85%;">[<a class="external text" href="https://en.wikipedia.org/w/index.php?title=ISO_8601&action=purge">refresh</a>]</span></td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/ISO_week_date" title="ISO week date">Week</a></th><td class="infobox-data">2024-W48</td></tr><tr><th scope="row" class="infobox-label">Week with weekday</th><td class="infobox-data">2024-W48-7</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Ordinal_date" title="Ordinal date">Ordinal date</a></th><td class="infobox-data">2024‐336</td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output 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a{color:var(--color-progressive)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><table class="sidebar sidebar-collapse nomobile nowraplinks"><tbody><tr><th class="sidebar-title" style="background:#ccccff;"><a href="/wiki/Time" title="Time">Time</a></th></tr><tr><td class="sidebar-image"><span typeof="mw:File"><a href="/wiki/File:MontreGousset001.jpg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/MontreGousset001.jpg/220px-MontreGousset001.jpg" decoding="async" width="220" height="192" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/MontreGousset001.jpg/330px-MontreGousset001.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/MontreGousset001.jpg/440px-MontreGousset001.jpg 2x" data-file-width="800" data-file-height="697" /></a></span></td></tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c">Major concepts</div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Past" title="Past">Past</a></li> <li><a href="/wiki/Present" title="Present">Present</a></li> <li><a href="/wiki/Future" title="Future">Future</a></li></ul> <ul><li><a href="/wiki/Eternity" title="Eternity">Eternity</a> <ul><li><a href="/wiki/Eternity_of_the_world" title="Eternity of the world">of the world</a></li></ul></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c">Fields of study</div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Archaeology" title="Archaeology">Archaeology</a></li> <li><a href="/wiki/Chronology" title="Chronology">Chronology</a></li> <li><a href="/wiki/History" title="History">History</a></li> <li><a href="/wiki/Horology" class="mw-redirect" title="Horology">Horology</a></li> <li><a href="/wiki/Time_metrology" class="mw-redirect" title="Time metrology">Metrology</a></li> <li><a href="/wiki/Paleontology" title="Paleontology">Paleontology</a></li> <li><a href="/wiki/Futures_studies" title="Futures studies">Futurology</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c"><a href="/wiki/Philosophy_of_space_and_time" title="Philosophy of space and time">Philosophy</a></div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Philosophical_presentism" title="Philosophical presentism">Presentism</a></li> <li><a href="/wiki/Eternalism_(philosophy_of_time)" title="Eternalism (philosophy of time)">Eternalism</a></li> <li><a href="/wiki/Event_(philosophy)" title="Event (philosophy)">Event</a></li> <li><a href="/wiki/Fatalism" title="Fatalism">Fatalism</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c"><div class="hlist nowrap"><ul><li><a href="/wiki/Category:Time_in_religion" title="Category:Time in religion">Religion</a></li><li>Mythology</li></ul></div></div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Creation_myth" title="Creation myth">Creation</a></li> <li><a href="/wiki/Eschatology" title="Eschatology">End time</a></li> <li><a href="/wiki/Last_Judgment" title="Last Judgment">Day of Judgement</a></li> <li><a href="/wiki/Immortality" title="Immortality">Immortality</a></li> <li><a href="/wiki/Afterlife" title="Afterlife">Afterlife</a></li> <li><a href="/wiki/Reincarnation" title="Reincarnation">Reincarnation</a></li> <li><a href="/wiki/Kalachakra" title="Kalachakra">Kalachakra</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c"><div class="hlist nowrap"><ul><li><a href="/wiki/Chronometry" title="Chronometry">Measurement</a></li><li><a href="/wiki/Time_standard" title="Time standard">Standards</a></li></ul></div></div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a class="mw-selflink selflink">ISO 8601</a></li> <li><a href="/wiki/Metric_time" title="Metric time">Metric</a></li> <li><a href="/wiki/Hexadecimal_time" title="Hexadecimal time">Hexadecimal</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c"><div class="hlist nowrap"><ul><li>Science</li><li><a href="/wiki/Naturalism_(philosophy)" title="Naturalism (philosophy)">Naturalism</a></li></ul></div></div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Chronobiology" title="Chronobiology">Chronobiology</a></li> <li><a href="/wiki/Cosmogony" title="Cosmogony">Cosmogony</a></li> <li><a href="/wiki/Evolution" title="Evolution">Evolution</a></li> <li><a href="/wiki/Radiometric_dating" title="Radiometric dating">Radiometric dating</a></li> <li><a href="/wiki/Ultimate_fate_of_the_universe" title="Ultimate fate of the universe"><span class="wrap">Ultimate fate of the universe</span></a></li> <li><a href="/wiki/Time_in_physics" title="Time in physics">Time in physics</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="background:#ddddff;background:#ddf;padding-bottom:0;color: var(--color-base)"><div class="sidebar-list-title-c">Related topics</div></div><div class="sidebar-list-content mw-collapsible-content hlist"> <ul><li><a href="/wiki/Motion" title="Motion">Motion</a></li> <li><a href="/wiki/Space" title="Space">Space</a></li> <li><a href="/wiki/Spacetime" title="Spacetime">Spacetime</a></li> <li><a href="/wiki/Time_travel" title="Time travel">Time travel</a></li></ul></div></div></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Time_sidebar" title="Template:Time sidebar"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Time_sidebar" title="Template talk:Time sidebar"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Time_sidebar" title="Special:EditPage/Template:Time sidebar"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> <p><b>ISO 8601</b> is an <a href="/wiki/International_standard" title="International standard">international standard</a> covering the worldwide exchange and communication of <a href="/wiki/Calendar_date" title="Calendar date">date</a> and <a href="/wiki/Time" title="Time">time</a>-related data. It is maintained by the <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">International Organization for Standardization</a> (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022.<sup id="cite_ref-iso8601amd1_1-0" class="reference"><a href="#cite_note-iso8601amd1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The standard provides a well-defined, unambiguous method of representing calendar dates and times in worldwide communications, especially to avoid misinterpreting numeric dates and times when such data is transferred between <a href="/wiki/Date_and_time_representation_by_country" title="Date and time representation by country">countries with different conventions</a> for writing numeric dates and times. </p><p>ISO 8601 applies to these representations and formats: <i>dates</i>, in the <a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian</a> calendar (including the <a href="/wiki/Proleptic_Gregorian_calendar" title="Proleptic Gregorian calendar">proleptic Gregorian</a> calendar); <i>times</i>, based on the <a href="/wiki/24-hour_clock" title="24-hour clock">24-hour timekeeping system</a>, with optional <a href="/wiki/UTC_offset" title="UTC offset">UTC offset</a>; <i><a href="/wiki/Time_interval" class="mw-redirect" title="Time interval">time intervals</a></i>; and combinations thereof.<sup id="cite_ref-scope_2-0" class="reference"><a href="#cite_note-scope-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The standard does not assign specific meaning to any element of the dates/times represented: the meaning of any element depends on the context of its use. Dates and times represented cannot use words that do not have a specified numerical meaning within the standard (thus excluding <a href="/wiki/Chinese_calendar_correspondence_table" title="Chinese calendar correspondence table">names of years</a> in the <a href="/wiki/Chinese_calendar" title="Chinese calendar">Chinese calendar</a>), or that do not use <a href="/wiki/Character_(computing)" title="Character (computing)">computer characters</a> (excludes images or sounds).<sup id="cite_ref-scope_2-1" class="reference"><a href="#cite_note-scope-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>In representations that adhere to the ISO 8601 <i>interchange standard</i>, dates and times are arranged such that the greatest temporal term (typically a year) is placed at the left and each successively lesser term is placed to the right of the previous term. Representations must be written in a combination of <a href="/wiki/Arabic_numerals" title="Arabic numerals">Arabic numerals</a> and the specific computer characters (such as "‐", ":", "T", "W", "Z") that are assigned specific meanings within the standard; that is, such commonplace descriptors of dates (or parts of dates) as "January", "Thursday", or "New Year's Day" are not allowed in interchange representations within the standard. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The first edition of the ISO 8601 standard was published as <i>ISO 8601:1988</i> in 1988. It unified and replaced a number of older ISO standards on various aspects of date and time notation: <a href="/wiki/ISO_2014" title="ISO 2014">ISO 2014</a>, <a href="/wiki/ISO_2015" title="ISO 2015">ISO 2015</a>, <a href="/wiki/ISO_2711" title="ISO 2711">ISO 2711</a>, <a href="/wiki/ISO_3307" title="ISO 3307">ISO 3307</a>, and <a href="/wiki/ISO_4031" title="ISO 4031">ISO 4031</a>.<sup id="cite_ref-doc2004_3-0" class="reference"><a href="#cite_note-doc2004-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It has been superseded by a second edition <i>ISO 8601:2000</i> in 2000, by a third edition <i>ISO 8601:2004</i> published on 1 December 2004, and withdrawn and revised by <i>ISO 8601-1:2019</i> and <i>ISO 8601-2:2019</i> on 25 February 2019. ISO 8601 was prepared by,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> and is under the direct responsibility of, <a href="/wiki/List_of_ISO_technical_committees" title="List of ISO technical committees">ISO Technical Committee</a> TC 154.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>ISO 2014, though superseded, is the standard that originally introduced the all-numeric date notation in <a href="/wiki/Significant_figures" title="Significant figures">most-to-least-significant</a> order <span class="nowrap">[YYYY]-[MM]-[DD]</span>. The ISO week numbering system was introduced in ISO 2015, and the identification of days by ordinal dates was originally defined in ISO 2711. </p><p>Issued in February 2019,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> the fourth revision of the standard ISO 8601-1:2019 represents slightly updated contents of the previous ISO 8601:2004 standard,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> whereas the new ISO 8601-2:2019 defines various extensions such as uncertainties or parts of the <a href="#EDTF">Extended Date/Time Format</a> (EDTF).<sup id="cite_ref-EDTF_2019_Spec_9-0" class="reference"><a href="#cite_note-EDTF_2019_Spec-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-EDTF_2019_Background_10-0" class="reference"><a href="#cite_note-EDTF_2019_Background-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-EDTF_2014_11-0" class="reference"><a href="#cite_note-EDTF_2014-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p><p>An amendment was published in October 2022 featuring minor technical clarifications and attempts to remove ambiguities in definitions. The most significant change, however, was the reintroduction of the "24:00:00" format to refer to the instant at the <i>end</i> of a calendar day. </p> <table class="wikitable sortable"> <caption>History of published editions and amendments </caption> <tbody><tr> <th>Name</th> <th>Description </th></tr> <tr> <td>ISO 8601:1988</td> <td>Data elements and interchange formats — Information interchange — Representation of dates and times </td></tr> <tr> <td>ISO 8601:1988/COR 1:1991</td> <td>Data elements and interchange formats — Information interchange — Representation of dates and times — Technical Corrigendum 1 </td></tr> <tr> <td>ISO 8601:2000</td> <td>Data elements and interchange formats — Information interchange — Representation of dates and times </td></tr> <tr> <td>ISO 8601:2004</td> <td>Data elements and interchange formats — Information interchange — Representation of dates and times </td></tr> <tr> <td>ISO 8601-1:2019</td> <td>Date and time — Representations for information interchange — Part 1: Basic rules </td></tr> <tr> <td>ISO 8601-2:2019</td> <td>Date and time — Representations for information interchange — Part 2: Extensions </td></tr> <tr> <td>ISO 8601-1:2019/Amd 1:2022</td> <td>Date and time — Representations for information interchange — Part 1: Basic rules — Amendment 1: Technical corrections </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="General_principles">General principles</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=2" title="Edit section: General principles"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Date and time values are ordered from the largest to smallest unit of time: year, month (or week), day, hour, minute, second, and fraction of second. The <a href="/wiki/Lexicographical_order" class="mw-redirect" title="Lexicographical order">lexicographical order</a> of the representation thus corresponds to chronological order, except for date representations involving negative years or time offset. This allows dates to be naturally <a href="/wiki/Sorting" title="Sorting">sorted</a> by, for example, file systems.</li> <li>Each date and time value has a fixed number of digits that must be padded with <a href="/wiki/Leading_zero" title="Leading zero">leading zeros</a>.</li> <li>Representations can be done in one of two formats – a <i>basic format</i> with a minimal number of separators or an <i>extended format</i> with separators added to enhance human readability.<sup id="cite_ref-isofaqtnd_15-0" class="reference"><a href="#cite_note-isofaqtnd-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> The standard notes that "The basic format should be avoided in <a href="/wiki/Plain_text" title="Plain text">plain text</a>."<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> The separator used between date values (year, month, week, and day) is the <a href="/wiki/Hyphen" title="Hyphen">hyphen</a>, while the <a href="/wiki/Colon_(punctuation)" title="Colon (punctuation)">colon</a> is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as <span class="nowrap">"2009-01-06"</span> in the extended format or as "20090106" in the basic format without ambiguity.</li> <li><span class="anchor" id="Reduced_precision"></span> For reduced <a href="/wiki/Precision_and_accuracy" class="mw-redirect" title="Precision and accuracy">precision</a>,<sup id="cite_ref-AccuracyVsPrecision_18-0" class="reference"><a href="#cite_note-AccuracyVsPrecision-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> any number of values may be dropped from any of the date and time representations, but in the order from the least to the most significant. For example, "2004-05" is a valid ISO 8601 date, which indicates May (the fifth month) 2004. This format will never represent the 5th day of an unspecified month in 2004, nor will it represent a time-span extending from 2004 into 2005.</li> <li>If necessary for a particular application, the standard supports the addition of a <a href="/wiki/Decimal_fractions" class="mw-redirect" title="Decimal fractions">decimal fraction</a> to the smallest time value in the representation.</li></ul> <div class="mw-heading mw-heading2"><h2 id="Dates">Dates</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=3" title="Edit section: Dates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable floatright" style="text-align:center;"> <caption>December 2024 </caption> <tbody><tr> <th width="%" scope="column" style="font-family: monospace;">Week </th> <th width="%" scope="column" style="font-family: monospace;" title="Monday">Mon </th> <th width="%" scope="column" style="font-family: monospace;" title="Tuesday">Tue </th> <th width="%" scope="column" style="font-family: monospace;" title="Wednesday">Wed </th> <th width="%" scope="column" style="font-family: monospace;" title="Thursday">Thu </th> <th width="%" scope="column" style="font-family: monospace;" title="Friday">Fri </th> <th width="%" scope="column" style="font-family: monospace;" title="Saturday">Sat </th> <th width="%" scope="column" style="font-family: monospace;" title="Sunday">Sun </th></tr> <tr> <th scope="row" title="days in calendar week number 48"><span style="opacity:0.7;">W48</span> </th> <td style="opacity:0.3;" title="2024-11-25 ≔ 2024-W48-1">25 </td> <td style="opacity:0.3;" title="2024-11-26 ≔ 2024-W48-2">26 </td> <td style="opacity:0.3;" title="2024-11-27 ≔ 2024-W48-3">27 </td> <td style="opacity:0.3;" title="2024-11-28 ≔ 2024-W48-4">28 </td> <td style="opacity:0.3;" title="2024-11-29 ≔ 2024-W48-5">29 </td> <td style="opacity:0.3;" title="2024-11-30 ≔ 2024-W48-6">30 </td> <td style="background-color: gold" title="2024-12-01 ≔ 2024-W48-7">01 </td></tr> <tr> <th scope="row" title="days in calendar week number 49"><span style="opacity:0.7;">W49</span> </th> <td style="" title="2024-12-02 ≔ 2024-W49-1">02 </td> <td style="" title="2024-12-03 ≔ 2024-W49-2">03 </td> <td style="" title="2024-12-04 ≔ 2024-W49-3">04 </td> <td style="" title="2024-12-05 ≔ 2024-W49-4">05 </td> <td style="" title="2024-12-06 ≔ 2024-W49-5">06 </td> <td style="" title="2024-12-07 ≔ 2024-W49-6">07 </td> <td style="" title="2024-12-08 ≔ 2024-W49-7">08 </td></tr> <tr> <th scope="row" title="days in calendar week number 50"><span style="opacity:0.7;">W50</span> </th> <td style="" title="2024-12-09 ≔ 2024-W50-1">09 </td> <td style="" title="2024-12-10 ≔ 2024-W50-2">10 </td> <td style="" title="2024-12-11 ≔ 2024-W50-3">11 </td> <td style="" title="2024-12-12 ≔ 2024-W50-4">12 </td> <td style="" title="2024-12-13 ≔ 2024-W50-5">13 </td> <td style="" title="2024-12-14 ≔ 2024-W50-6">14 </td> <td style="" title="2024-12-15 ≔ 2024-W50-7">15 </td></tr> <tr> <th scope="row" title="days in calendar week number 51"><span style="opacity:0.7;">W51</span> </th> <td style="" title="2024-12-16 ≔ 2024-W51-1">16 </td> <td style="" title="2024-12-17 ≔ 2024-W51-2">17 </td> <td style="" title="2024-12-18 ≔ 2024-W51-3">18 </td> <td style="" title="2024-12-19 ≔ 2024-W51-4">19 </td> <td style="" title="2024-12-20 ≔ 2024-W51-5">20 </td> <td style="" title="2024-12-21 ≔ 2024-W51-6">21 </td> <td style="" title="2024-12-22 ≔ 2024-W51-7">22 </td></tr> <tr> <th scope="row" title="days in calendar week number 52"><span style="opacity:0.7;">W52</span> </th> <td style="" title="2024-12-23 ≔ 2024-W52-1">23 </td> <td style="" title="2024-12-24 ≔ 2024-W52-2">24 </td> <td style="" title="2024-12-25 ≔ 2024-W52-3">25 </td> <td style="" title="2024-12-26 ≔ 2024-W52-4">26 </td> <td style="" title="2024-12-27 ≔ 2024-W52-5">27 </td> <td style="" title="2024-12-28 ≔ 2024-W52-6">28 </td> <td style="" title="2024-12-29 ≔ 2024-W52-7">29 </td></tr> <tr> <th scope="row" title="days in calendar week number 1"><span style="opacity:0.7;">W01</span> </th> <td style="" title="2024-12-30 ≔ 2025-W01-1">30 </td> <td style="" title="2024-12-31 ≔ 2025-W01-2">31 </td> <td style="opacity:0.3;" title="2025-01-01 ≔ 2025-W01-3">01 </td> <td style="opacity:0.3;" title="2025-01-02 ≔ 2025-W01-4">02 </td> <td style="opacity:0.3;" title="2025-01-03 ≔ 2025-W01-5">03 </td> <td style="opacity:0.3;" title="2025-01-04 ≔ 2025-W01-6">04 </td> <td style="opacity:0.3;" title="2025-01-05 ≔ 2025-W01-7">05 </td></tr></tbody></table> <p>The standard uses the <a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian calendar</a>, which "serves as an international standard for civil use".<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p><p>ISO 8601:2004 fixes a reference calendar date to the Gregorian calendar of 20 May 1875 as the date the <span title="French-language text"><i lang="fr">Convention du Mètre</i></span> (<a href="/wiki/Metre_Convention" title="Metre Convention">Metre Convention</a>) was signed in <a href="/wiki/Paris" title="Paris">Paris</a> (the explicit reference date was removed in ISO 8601-1:2019). However, ISO calendar dates before the convention are still compatible with the Gregorian calendar all the way back to the official introduction of the Gregorian calendar on 15 October 1582. </p><p>Earlier dates, in the <a href="/wiki/Proleptic_Gregorian_calendar" title="Proleptic Gregorian calendar">proleptic Gregorian calendar</a>, may be used by mutual agreement of the partners exchanging information. The standard states that every date must be consecutive, so usage of the <a href="/wiki/Julian_calendar" title="Julian calendar">Julian calendar</a> would be contrary to the standard (because at the switchover date, the dates would not be consecutive). </p> <div class="mw-heading mw-heading3"><h3 id="Years">Years</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=4" title="Edit section: Years"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td>YYYY </td></tr> <tr> <td>±<u>Y</u>YYYY </td></tr></tbody></table> <p>ISO 8601 prescribes, as a minimum, a four-digit year [YYYY] to avoid the <a href="/wiki/Year_2000_problem" title="Year 2000 problem">year 2000 problem</a>. It therefore represents years from 0000 to 9999, year 0000 being equal to 1 <a href="/wiki/Anno_Domini" title="Anno Domini">BC</a> and all others <a href="/wiki/AD" class="mw-redirect" title="AD">AD</a>, similar to <a href="/wiki/Astronomical_year_numbering" title="Astronomical year numbering">astronomical year numbering</a>. However, years before 1583 (the first full year following the introduction of the <a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian calendar</a>) are not automatically allowed by the standard. Instead, the standard states that "values in the range [0000] through [1582] shall only be used by mutual agreement of the partners in information interchange".<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p><p>To represent years before <a href="/wiki/Year_zero" title="Year zero">0000</a> or after <a href="/wiki/Year_10,000_problem" class="mw-redirect" title="Year 10,000 problem">9999</a>, the standard also permits the expansion of the year representation but only by prior agreement between the sender and the receiver.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> An expanded year representation [±<u>Y</u>YYYY] must have an agreed-upon number of extra year digits beyond the four-digit minimum, and it must be prefixed with a + or − sign<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> instead of the more common <a href="/wiki/Anno_Domini" title="Anno Domini">AD/BC</a> (or <a href="/wiki/Common_Era" title="Common Era">CE/BCE</a>) notation; by convention 1 BC is labelled <a href="/wiki/Year_zero" title="Year zero">+0000</a>, 2 BC is labeled −0001, and so on.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Calendar_dates">Calendar dates</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=5" title="Edit section: Calendar dates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td><span class="nowrap">YYYY-MM-DD</span></td> <td><i>or</i></td> <td>YYYYMMDD </td></tr> <tr> <td><span class="nowrap">YYYY-MM</span> </td> <td colspan="2">(<i>but not</i> YYYYMM) </td></tr> <tr> <td colspan="3"><b>Only allowed in the (now superseded) 2000 version:</b><sup id="cite_ref-datewithoutyear_24-0" class="reference"><a href="#cite_note-datewithoutyear-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><span class="nowrap">YY-MM-DD</span></td> <td><i>or</i></td> <td>YYMMDD </td></tr> <tr> <td><span class="nowrap">-YY-MM</span></td> <td><i>or</i></td> <td>-YYMM </td></tr> <tr> <td><span class="nowrap">--MM-DD</span></td> <td><i>or</i></td> <td>--MMDD </td></tr> <tr> <td><span class="nowrap">--MM</span> </td></tr> <tr> <td><span class="nowrap">---DD</span> </td></tr></tbody></table> <p>Calendar date representations are in the form shown in the adjacent box. [YYYY] indicates a four-digit year, 0000 through 9999. [MM] indicates a two-digit month of the year, 01 through 12. [DD] indicates a two-digit day of that month, 01 through 31. For example, "5 April 1981" may be represented as either <span class="nowrap">"1981-04-05"</span><sup id="cite_ref-isofaqtnd_15-1" class="reference"><a href="#cite_note-isofaqtnd-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> in the <i>extended format</i> or "19810405" in the <i>basic format</i>. </p><p>The standard also allows for calendar dates to be written with reduced precision. For example, one may write <span class="nowrap">"1981-04"</span> to mean "1981 April". One may simply write "1981" to refer to that year, "198" to refer to the <a href="/wiki/Decade" title="Decade">decade</a> from 1980 to 1989 inclusive, or "19" to refer to the <a href="/wiki/Century" title="Century">century</a> from 1900 to 1999 inclusive. Although the standard allows both the <span class="nowrap">"YYYY-MM-DD"</span> and YYYYMMDD formats for complete calendar date representations, if the day [DD] is omitted then only the <span class="nowrap">YYYY-MM</span> format is allowed. By disallowing dates of the form YYYYMM, the standard avoids confusion with the <a href="#Truncated_representations">truncated representation</a><sup id="cite_ref-iso8601amd1_1-1" class="reference"><a href="#cite_note-iso8601amd1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-doc2004_3-1" class="reference"><a href="#cite_note-doc2004-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> YYMMDD (still often used). The 2000 version also allowed writing the truncation <span class="nowrap">"--04-05"</span> to mean "April 5"<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> but the 2004 version does not allow omitting the year when a month is present. </p><p>Examples: </p> <ul><li>7 January 2000 can be written as "2000-01-07" or "20000107"</li></ul> <div class="mw-heading mw-heading3"><h3 id="Week_dates">Week dates</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=6" title="Edit section: Week dates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/ISO_week_date" title="ISO week date">ISO week date</a></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td>YYYY-Www</td> <td><i>or</i></td> <td>YYYYWww </td></tr> <tr> <td>YYYY-Www-D</td> <td><i>or</i></td> <td>YYYYWwwD </td></tr></tbody></table> <p>Week date representations are in the formats as shown in the adjacent box. [YYYY] indicates the <i>ISO week-numbering year</i> which is slightly different from the traditional <a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian calendar</a> year (see below). [Www] is the <i><a href="/wiki/Week_number" class="mw-redirect" title="Week number">week number</a></i> prefixed by the letter <i>W</i>, from W01 through W53. [D] is the <i>weekday number</i>, from 1 through 7, beginning with Monday and ending with Sunday. </p><p>There are several mutually equivalent and compatible descriptions of week 01: </p> <ul><li>the week with the first <a href="/wiki/Business_day" title="Business day">business day</a> in the starting year (considering that Saturdays, Sundays and 1 January are non-working days),</li> <li>the week with the starting year's first Thursday in it (the formal ISO definition),</li> <li>the week with 4 January in it,</li> <li>the first week with the majority (four or more) of its days in the starting year, and</li> <li>the week starting with the Monday in the period 29 December to 4 January.</li></ul> <p>As a consequence, if 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01. If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous year (there is no week 00). 28 December is always in the last week of its year. </p><p>The week number can be described by counting the Thursdays: week 12 contains the 12th Thursday of the year. </p><p>The <i>ISO week-numbering year</i> starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks. The first ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is ending; if three, they are Monday, Tuesday and Wednesday. Similarly, the last ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is starting; if three, they are Friday, Saturday, and Sunday. The Thursday of each ISO week is always in the Gregorian calendar year denoted by the ISO week-numbering year. </p><p>Examples: </p> <ul><li>Monday 29 December 2008 is written "2009-W01-1"</li> <li>Sunday 3 January 2010 is written "2009-W53-7"</li></ul> <div class="mw-heading mw-heading3"><h3 id="Ordinal_dates">Ordinal dates</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=7" title="Edit section: Ordinal dates"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td>YYYY-DDD</td> <td><i>or</i></td> <td>YYYYDDD </td></tr></tbody></table> <p>An <i><a href="/wiki/Ordinal_date" title="Ordinal date">ordinal date</a></i> is an <a href="/wiki/Ordinal_number" title="Ordinal number">ordinal</a> format for the multiples of a day elapsed since the start of year. It is represented as "YYYY-DDD" (or YYYYDDD), where [YYYY] indicates a year and [DDD] is the "day of year", from 001 through 365 (366 in <a href="/wiki/Leap_year" title="Leap year">leap years</a>). For example, <span class="nowrap">"1981-04-05"</span> is the same as <span class="nowrap">"1981-095"</span>. </p><p>This simple form is preferable for occasions when the arbitrary nature of week and month definitions are more of an impediment than an aid, for instance, when comparing dates from different calendars. This format is used with simple hardware systems that have a need for a date system, but where including full calendar calculation software may be a significant nuisance. This system is sometimes referred to as "Julian Date", but this can cause confusion with the astronomical <a href="/wiki/Julian_day" title="Julian day">Julian day</a>, a sequential count of the number of days since day 0 beginning <span class="nowrap">1 January 4713 BC</span> Greenwich noon, Julian proleptic calendar (or noon on ISO date <span class="nowrap">−4713-11-24</span> which uses the Gregorian proleptic calendar with a year 0000). </p> <div class="mw-heading mw-heading2"><h2 id="Times">Times</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=8" title="Edit section: Times"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td>Thh:mm:ss.sss </td> <td><i>or</i> </td> <td>Thhmmss.sss </td></tr> <tr> <td>Thh:mm:ss</td> <td><i>or</i></td> <td>Thhmmss </td></tr> <tr> <td>Thh:mm.mmm</td> <td><i>or</i></td> <td>Thhmm.mmm </td></tr> <tr> <td>Thh:mm</td> <td><i>or</i></td> <td>Thhmm </td></tr> <tr> <td>Thh.hhh</td> <td></td> <td> </td></tr> <tr> <td>Thh</td> <td></td> <td> </td></tr> <tr> <td colspan="3"><b>In unambiguous contexts</b> </td></tr> <tr> <td>hh:mm:ss.sss </td> <td><i>or</i> </td> <td>hhmmss.sss </td></tr> <tr> <td>hh:mm:ss</td> <td><i>or</i></td> <td>hhmmss </td></tr> <tr> <td>hh:mm</td> <td><i>or</i></td> <td>hhmm </td></tr> <tr> <td>hh</td> <td></td> <td> </td></tr></tbody></table> <p>ISO 8601 uses the <a href="/wiki/24-hour_clock" title="24-hour clock">24-hour clock</a> system. As of ISO 8601-1:2019, the <i>basic format</i> is T[hh][mm][ss] and the <i>extended format</i> is T[hh]:[mm]:[ss]. Earlier versions omitted the T (representing time) in both formats. </p> <ul><li>[hh] refers to a zero-padded <a href="/wiki/Hour" title="Hour">hour</a> between 00 and 24.</li> <li>[mm] refers to a zero-padded <a href="/wiki/Minute" title="Minute">minute</a> between 00 and 59.</li> <li>[ss] refers to a zero-padded <a href="/wiki/Second" title="Second">second</a> between 00 and 60 (where 60 is only used to denote an added <a href="/wiki/Leap_second" title="Leap second">leap second</a>).</li></ul> <p>So a time might appear as either "T134730" in the <i>basic format</i> or "T13:47:30" in the <i>extended format</i>. ISO 8601-1:2019 allows the T to be omitted in the extended format, as in "13:47:30", but only allows the T to be omitted in the basic format when there is no risk of confusion with date expressions. </p><p>Either the seconds, or the minutes and seconds, may be omitted from the basic or extended time formats for greater brevity but decreased precision; the resulting reduced precision time formats are:<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p> <ul><li>T[hh][mm] in <i>basic format</i> or T[hh]:[mm] in <i>extended format</i>, when seconds are omitted.</li> <li>T[hh], when both seconds and minutes are omitted.</li></ul> <p>As of ISO 8601-1:2019/Amd 1:2022, "00:00:00" may be used to refer to <i><a href="/wiki/Midnight" title="Midnight">midnight</a></i> corresponding to the instant at the beginning of a calendar day; and "24:00:00" to refer to midnight corresponding to the instant at the end of a calendar day.<sup id="cite_ref-iso8601amd1_1-2" class="reference"><a href="#cite_note-iso8601amd1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> ISO 8601-1:2019 as originally published removed "24:00:00" as a representation for the end of day although it had been permitted in earlier versions of the standard. </p><p>A decimal fraction may be added to the lowest order time element present in any of these representations. A <a href="/wiki/Decimal_mark" class="mw-redirect" title="Decimal mark">decimal mark</a>, either a <a href="/wiki/Comma_(punctuation)" class="mw-redirect" title="Comma (punctuation)">comma</a> or a <a href="/wiki/Full_stop" title="Full stop">dot on the baseline</a>, is used as a separator between the time element and its fraction. (Following <a href="/wiki/ISO/IEC_80000" title="ISO/IEC 80000">ISO 80000-1</a> according to ISO 8601:1-2019,<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> it does not stipulate a preference except within International Standards, but with a preference for a <a href="/wiki/Comma_(punctuation)" class="mw-redirect" title="Comma (punctuation)">comma</a> according to ISO 8601:2004.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup>) For example, to denote "14 hours, 30 and one half minutes", do not include a seconds figure; represent it as "14:30,5", "T1430,5", "14:30.5", or "T1430.5". </p><p>There is no limit on the number of decimal places for the decimal fraction. However, the number of decimal places needs to be agreed to by the communicating parties. For example, in Microsoft SQL Server, the <a href="/wiki/Significant_figures" title="Significant figures">precision</a> of a decimal fraction is 3 for a DATETIME, i.e., "yyyy-mm-ddThh:mm:ss[.mmm]".<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Time_zone_designators">Time zone designators</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=9" title="Edit section: Time zone designators"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td><time>Z </td></tr> <tr> <td><time>±hh:mm </td></tr> <tr> <td><time>±hhmm </td></tr> <tr> <td><time>±hh </td></tr></tbody></table> <p><a href="/wiki/Time_zone" title="Time zone">Time zones</a> in ISO 8601 are represented as local time (with the location unspecified), as <a href="/wiki/UTC" class="mw-redirect" title="UTC">UTC</a>, or as an offset from UTC. </p> <div class="mw-heading mw-heading4"><h4 id="Local_time_(unqualified)"><span id="Local_time_.28unqualified.29"></span>Local time (unqualified)</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=10" title="Edit section: Local time (unqualified)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>If no UTC relation information is given with a time representation, the time is assumed to be in local time. While it <i>may</i> be safe to assume local time when communicating in the same time zone, it is ambiguous when used in communicating across different time zones. Even within a single geographic time zone, some local times will be ambiguous if the region observes <a href="/wiki/Daylight_saving_time" title="Daylight saving time">daylight saving time</a>. It is usually preferable to indicate a time zone (zone designator) using the standard's notation. </p> <div class="mw-heading mw-heading4"><h4 id="Coordinated_Universal_Time_(UTC)"><span id="Coordinated_Universal_Time_.28UTC.29"></span>Coordinated Universal Time (UTC)</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=11" title="Edit section: Coordinated Universal Time (UTC)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>If the time is in <a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">UTC</a>, add a <i>Z</i> directly after the time without a space. <i>Z</i> is the zone designator for the zero UTC offset. "09:30 UTC" is therefore represented as "09:30Z" or "T0930Z". "14:45:15 UTC" would be "14:45:15Z" or "T144515Z". </p><p>The <i>Z</i> suffix in the ISO 8601 time representation is sometimes referred to as "Zulu time" or "Zulu meridian" because the same letter is used to designate the <a href="/wiki/List_of_military_time_zones" class="mw-redirect" title="List of military time zones">Zulu time zone</a>.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> However the ACP 121 standard that defines the list of military time zones makes no mention of UTC and derives the "Zulu time" from the <a href="/wiki/Greenwich_Mean_Time" title="Greenwich Mean Time">Greenwich Mean Time</a><sup id="cite_ref-ACP_121_I_31-0" class="reference"><a href="#cite_note-ACP_121_I-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> which was formerly used as the international civil time standard. GMT is no longer precisely defined by the scientific community and can refer to either UTC or <a href="/wiki/UT1" class="mw-redirect" title="UT1">UT1</a> depending on context.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Time_offsets_from_UTC">Time offsets from UTC</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=12" title="Edit section: Time offsets from UTC"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/UTC_offset" title="UTC offset">UTC offset</a> is appended directly to the time instead of "Z" suffix above; other <a href="/wiki/Nautical_time" title="Nautical time">nautical time</a> zone letters are not used. The offset is applied to <a href="/wiki/UTC" class="mw-redirect" title="UTC">UTC</a> to get the <a href="/wiki/Civil_time" title="Civil time">civil time</a> in the designated <a href="/wiki/Time_zone" title="Time zone">time zone</a> in the format '±[hh]:[mm]', '±[hh][mm]', or '±[hh]'. </p><p>A negative <a href="/wiki/UTC_offset" title="UTC offset">UTC offset</a> describes a time zone west of the <a href="/wiki/Prime_meridian" title="Prime meridian">prime meridian</a> where the civil time is behind UTC. So the zone designation for <a href="/wiki/New_York_(city)" class="mw-redirect" title="New York (city)">New York</a> (on <a href="/wiki/Standard_time" title="Standard time">standard time</a>) would be "−05:00","−0500", or "−05". Conversely, a positive UTC offset describes a time zone east of the prime meridian where the civil time is ahead of <a href="/wiki/UTC" class="mw-redirect" title="UTC">UTC</a>. So the zone designation for <a href="/wiki/Cairo" title="Cairo">Cairo</a> will be "+02:00","+0200", or "+02". </p><p>A time zone where the civil time coincides with UTC is always designated as positive, though the offset is zero (see related specifications below). So the zone designation for <a href="/wiki/London" title="London">London</a> (on <a href="/wiki/Standard_time" title="Standard time">standard time</a>) would be "<a href="/wiki/UTC%2B00:00" title="UTC+00:00">+00:00</a>", "<a href="/wiki/UTC%2B00:00" title="UTC+00:00">+0000</a>", or "<a href="/wiki/UTC%2B00:00" title="UTC+00:00">+00</a>". </p> <div class="mw-heading mw-heading5"><h5 id="Additional_examples">Additional examples</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=13" title="Edit section: Additional examples"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>"<a href="/wiki/UTC-10:00" class="mw-redirect" title="UTC-10:00">−10:00</a>" for <a href="/wiki/Honolulu" title="Honolulu">Honolulu</a></li> <li>"<a href="/wiki/UTC-06:00" class="mw-redirect" title="UTC-06:00">−06:00</a>" for <a href="/wiki/Chicago" title="Chicago">Chicago</a> on <a href="/wiki/Standard_time" title="Standard time">standard time</a>, or <a href="/wiki/Denver" title="Denver">Denver</a> on <a href="/wiki/Daylight_saving_time" title="Daylight saving time">daylight saving time</a></li> <li>"<a href="/wiki/UTC-03:00" class="mw-redirect" title="UTC-03:00">−03:00</a>" for <a href="/wiki/Bras%C3%ADlia" title="Brasília">Brasília</a></li> <li>"<a href="/wiki/UTC%2B01:00" title="UTC+01:00">+01:00</a>" for <a href="/wiki/London" title="London">London</a> on <a href="/wiki/British_Summer_Time" title="British Summer Time">British Summer Time</a></li> <li>"<a href="/wiki/UTC%2B04:00" title="UTC+04:00">+04:00</a>" for <a href="/wiki/Dubai" title="Dubai">Dubai</a></li> <li>"<a href="/wiki/UTC%2B05:30" title="UTC+05:30">+05:30</a>" for <a href="/wiki/India" title="India">India</a></li> <li>"<a href="/wiki/UTC%2B09:00" title="UTC+09:00">+09:00</a>" for <a href="/wiki/Japan" title="Japan">Japan</a></li></ul> <p>See <a href="/wiki/List_of_UTC_offsets" title="List of UTC offsets">List of UTC offsets</a> for other <a href="/wiki/UTC_offset" title="UTC offset">UTC offsets</a>. </p> <div class="mw-heading mw-heading5"><h5 id="Other_time_offset_specifications">Other time offset specifications</h5><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=14" title="Edit section: Other time offset specifications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It is not permitted to state a zero value time offset with a negative sign, as "−00:00", "−0000", or "−00". The section dictating sign usage states that a plus sign must be used for a positive or zero value, and a minus sign for a negative value. A <a href="/wiki/Plus-minus_sign" class="mw-redirect" title="Plus-minus sign">plus-minus-sign (<span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">±</span>)</a> may also be used if it is available.<sup id="cite_ref-33" class="reference"><a href="#cite_note-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> </p><p>Contrary to this rule, RFC 3339, which is otherwise a profile of ISO 8601, permits the use of "−00" with the same denotation as "+00" but a differing connotation: an unknown <a href="/wiki/UTC_offset" title="UTC offset">UTC offset</a>.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </p><p>To represent a negative offset, ISO 8601 specifies using a <a href="/wiki/Minus_sign" class="mw-redirect" title="Minus sign">minus sign (<span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">−</span>)</a>. If the interchange character set is limited and does not have a minus sign character, then the <a href="/wiki/Hyphen-minus" title="Hyphen-minus">hyphen-minus</a> should be used, (<span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">-</span>).<sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> <a href="/wiki/ASCII" title="ASCII">ASCII</a> does not have a minus sign, so its hyphen-minus character (code 45<sub>10</sub>) would be used. If the character set has a minus sign, such as <span class="nowrap"><style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><span class="monospaced">U+2212</span> </span><span style="font-size:125%;line-height:1em">−</span> <span style="font-variant: small-caps; text-transform: lowercase;">MINUS SIGN</span> in <a href="/wiki/Unicode" title="Unicode">Unicode</a>, then that character should be used. The <a href="/wiki/HTML_entity" class="mw-redirect" title="HTML entity">HTML character entity</a> invocation for <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">−</span> is <code>&minus;</code>. </p><p>ISO 8601-2:2019 allows for general durations for time offsets. For example, more precision can be added to the time offset with the format '<time>±[hh]:[mm]:[ss].[sss]' or '<time>±[n]H[n]M[n]S' as below. </p> <div class="mw-heading mw-heading2"><h2 id="Combined_date_and_time_representations">Combined date and time representations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=15" title="Edit section: Combined date and time representations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td><date>T<time> </td></tr></tbody></table> <p>A single point in time can be represented by concatenating a complete date expression, the letter <i>"T"</i> as a delimiter, and a valid time expression. For example, <span class="nowrap">"2007-04-05T14:30"</span>. In ISO 8601:2004 it was permitted to omit the <i>"T"</i> character by mutual agreement as in <span class="nowrap">"200704051430"</span>,<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> but this provision was removed in ISO 8601-1:2019. Separating date and time parts with other characters such as space is not allowed in ISO 8601, but allowed in its profile RFC 3339.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup> </p><p>If a time zone designator is required, it follows the combined date and time. For example, <span class="nowrap">"2007-04-05T14:30Z"</span> or <span class="nowrap">"2007-04-05T12:30−02:00"</span>. </p><p>Either basic or extended formats may be used, but both date and time must use the same format. The date expression may be calendar, week, or ordinal, and must use a complete representation. The time may be represented using a specified reduced precision format. </p> <div class="mw-heading mw-heading2"><h2 id="Durations">Durations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=16" title="Edit section: Durations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td>PnYnMnDTnHnMnS </td></tr> <tr> <td>PnW </td></tr> <tr> <td>P<date>T<time> </td></tr></tbody></table> <p>Durations define the amount of intervening time in a time interval and are represented by the format P[n]Y[n]M[n]DT[n]H[n]M[n]S or P[n]W as shown on the aside. In these representations, the [n] is replaced by the value for each of the date and time elements that follow the [n]. Leading zeros are not required, but the maximum number of digits for each element should be agreed to by the communicating parties. The capital letters <i>P</i>, <i>Y</i>, <i>M</i>, <i>W</i>, <i>D</i>, <i>T</i>, <i>H</i>, <i>M</i>, and <i>S</i> are designators for each of the date and time elements and are not replaced. </p> <ul><li><i>P</i> is the duration designator (for <i>period</i>) placed at the start of the duration representation. <ul><li><i>Y</i> is the year designator that follows the value for the number of calendar years.</li> <li><i>M</i> is the month designator that follows the value for the number of calendar months.</li> <li><i>W</i> is the week designator that follows the value for the number of weeks.</li> <li><i>D</i> is the day designator that follows the value for the number of calendar days.</li></ul></li> <li><i>T</i> is the time designator that precedes the time components of the representation. <ul><li><i>H</i> is the hour designator that follows the value for the number of hours.</li> <li><i>M</i> is the minute designator that follows the value for the number of minutes.</li> <li><i>S</i> is the second designator that follows the value for the number of seconds.</li></ul></li></ul> <p>For example, "P3Y6M4DT12H30M5S" represents a duration of "three years, six months, four days, twelve hours, thirty minutes, and five seconds". </p><p>Date and time elements including their designator may be omitted if their value is zero, and lower-order elements may also be omitted for reduced precision. For example, "P23DT23H" and "P4Y" are both acceptable duration representations. However, at least one element must be present, thus "P" is not a valid representation for a duration of 0 seconds. "PT0S" or "P0D", however, are both valid and represent the same duration. </p><p>To resolve ambiguity, "P1M" is a one-month duration and "PT1M" is a one-minute duration (note the time designator, T, that precedes the time value). The smallest value used may also have a decimal fraction,<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup> as in "P0.5Y" to indicate half a year. This decimal fraction may be specified with either a <a href="/wiki/Comma" title="Comma">comma</a> or a <a href="/wiki/Full_stop" title="Full stop">full stop</a>, as in "P0,5Y" or "P0.5Y". The standard does not prohibit date and time values in a duration representation from exceeding their "carry over points" except as noted below. Thus, "PT36H" could be used as well as "P1DT12H" for representing the same duration. But keep in mind that "PT36H" is not the same as "P1DT12H" when switching from or to <a href="/wiki/Daylight_saving_time" title="Daylight saving time">Daylight saving time</a>. </p><p>Alternatively, a format for duration based on combined date and time representations may be used by agreement between the communicating parties either in the basic format PYYYYMMDDThhmmss or in the extended format <span class="nowrap">P[YYYY]-[MM]-[DD]T[hh]:[mm]:[ss]</span>. For example, the first duration shown above would be <span class="nowrap">"P0003-06-04T12:30:05"</span>. However, individual date and time values cannot exceed their <a href="/wiki/Modular_arithmetic" title="Modular arithmetic">moduli</a> (e.g. a value of 13 for the month or 25 for the hour would not be permissible).<sup id="cite_ref-40" class="reference"><a href="#cite_note-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> </p><p>The standard describes a duration as part of time intervals, which are discussed in the next section. The duration format on its own is ambiguous regarding the total number of days in a calendar year and calendar month. The number of seconds in a calendar day is also ambiguous because of <a href="/wiki/Leap_second" title="Leap second">leap seconds</a>. For example "P1M" on its own could be 28, 29, 30, or 31 days. There is no ambiguity when used in a time interval. Using example "P2M" duration of two calendar months: </p> <ul><li>interval 2003-02-15T00:00:00Z/P2M ends two calendar months later at 2003-04-15T00:00:00Z which is 59 days later</li> <li>interval 2003-07-15T00:00:00Z/P2M ends two calendar months later at 2003-09-15T00:00:00Z which is 62 days later</li></ul> <p>The duration format (or a subset thereof) is widely used independent of time intervals, as with the Java 8 Duration class which supports a subset of the duration format.<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Time_intervals">Time intervals</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=17" title="Edit section: Time intervals"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td><start>/<end> </td></tr> <tr> <td><start>/<duration> </td></tr> <tr> <td><duration>/<end> </td></tr> <tr> <td><duration> </td></tr></tbody></table> <p>A time interval is the intervening time between two time points. The amount of intervening time is expressed by a duration (as described in the previous section). The two time points (start and end) are expressed by either a combined date and time representation or just a date representation. </p><p>There are four ways to express a time interval: </p> <ol><li>Start and end, such as "2007-03-01T13:00:00Z/2008-05-11T15:30:00Z"</li> <li>Start and duration, such as "2007-03-01T13:00:00Z/P1Y2M10DT2H30M"</li> <li>Duration and end, such as "P1Y2M10DT2H30M/2008-05-11T15:30:00Z"</li> <li>Duration only, such as "P1Y2M10DT2H30M", with additional context information</li></ol> <p>Of these, the first three require two values separated by an <i>interval designator</i> which is usually a solidus (more commonly referred to as a <a href="/wiki/Slash_(punctuation)" title="Slash (punctuation)">forward slash</a> "/"). Section 3.2.6 of ISO 8601-1:2019 notes that "A solidus may be replaced by a double hyphen ["--"] by mutual agreement of the communicating partners", and previous versions used notations like "2000--2002".<sup id="cite_ref-43" class="reference"><a href="#cite_note-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> Use of a double hyphen instead of a solidus allows inclusion in computer <a href="/wiki/Filename" title="Filename">filenames</a>;<sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> in common operating systems, a solidus is a <a href="/wiki/Filename#Reserved_characters_and_words" title="Filename">reserved character</a> and is not allowed in a filename. </p><p>For <start>/<end> expressions, if any elements are missing from the end value, they are assumed to be the same as for the start value including the time zone. This feature of the standard allows for concise representations of time intervals. For example, the date of a two-hour meeting including the start and finish times could be shown as "2007-12-14T13:30/15:30", where "/15:30" implies "/2007-12-14T15:30" (the same date as the start), or the beginning and end dates of a monthly billing period as "2008-02-15/03-14", where "/03-14" implies "/2008-03-14" (the same year as the start). </p><p>If greater precision is desirable to represent the time interval, then more time elements can be added to the representation. An interval denoted <span class="nowrap">"2007-11-13/15"</span> can start at any time on <span class="nowrap">2007-11-13</span> and end at any time on <span class="nowrap">2007-11-15</span>, whereas <span class="nowrap">"2007-11-13T09:00/15T17:00"</span> includes the start and end times. To explicitly include all of the start and end dates, the interval would be represented as <span class="nowrap">"2007-11-13T00:00/16T00:00"</span>. </p> <div class="mw-heading mw-heading3"><h3 id="Repeating_intervals">Repeating intervals</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=18" title="Edit section: Repeating intervals"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="infobox" style="text-align:center; width:23em"> <tbody><tr> <td>Rn/<interval> </td></tr> <tr> <td>R/<interval> </td></tr></tbody></table> <p>Repeating intervals are specified in clause "4.5 Recurring time interval". They are formed by adding "R[n]/" to the beginning of an interval expression, where <i>R</i> is used as the letter itself and [n] is replaced by the number of repetitions. Leaving out the value for [n] or specifying a value of -1, means an unbounded number of repetitions. A value of 0 for [n] means the interval is not repeated. </p><p>If the interval specifies the start (forms 1 and 2 above), then this is the start of the repeating interval. If the interval specifies the end but not the start (form 3 above), then this is the end of the repeating interval. For example, to repeat the interval of "P1Y2M10DT2H30M" five times starting at <span class="nowrap">"2008-03-01T13:00:00Z"</span>, use <span class="nowrap">"R5/2008-03-01T13:00:00Z/P1Y2M10DT2H30M"</span>. </p> <div class="mw-heading mw-heading2"><h2 id="Truncated_representations_(deprecated)"><span id="Truncated_representations_.28deprecated.29"></span><span class="anchor" id="Truncated_representations"></span>Truncated representations (deprecated)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=19" title="Edit section: Truncated representations (deprecated)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="#Reduced_precision">§ Reduced precision</a>.</div> <p>ISO 8601:2000 allowed truncation (by agreement), where leading components of a date or time are omitted. Notably, this allowed two-digit years to be used as well as the ambiguous formats YY-MM-DD and YYMMDD. This provision was removed in ISO 8601:2004. </p> <table class="wikitable"> <caption>Some Truncated Representations (last valid in ISO 8601:2000) </caption> <tbody><tr> <th>Type</th> <th>Basic format</th> <th>Basic example</th> <th>Extended format</th> <th>Extended example </th></tr> <tr> <td>A specific date in the implied century</td> <td>YYMMDD</td> <td>851026</td> <td>YY-MM-DD</td> <td>85-10-26 </td></tr> <tr> <td>A specific year and month in the implied century</td> <td>-YYMM</td> <td>-8510</td> <td>-YY-MM</td> <td>-85-10 </td></tr> <tr> <td>A specific year in the implied century</td> <td>-YY</td> <td>-85</td> <td colspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">— </td></tr> <tr> <td>A specific day of a month in the implied year</td> <td>--MMDD</td> <td>--1026</td> <td>--MM-DD</td> <td>--10-26 </td></tr> <tr> <td>A specific month in the implied year</td> <td>--MM</td> <td>--10</td> <td rowspan="2" colspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">— </td></tr> <tr> <td>A specific day in the implied month</td> <td>---DD</td> <td>---26 </td></tr> <tr> <td>A specific year and ordinal day in the implied century</td> <td>YYDDD</td> <td>85299</td> <td>YY-DDD</td> <td>85-299 </td></tr> <tr> <td>A specific ordinal day in the implied year</td> <td>-DDD</td> <td>-299</td> <td colspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">— </td></tr> <tr> <td>A specific year and week in the implied decade</td> <td>-YWww</td> <td>-5W43</td> <td>-Y-Www</td> <td>-5-W43 </td></tr> <tr> <td>A specific week and day in the implied year</td> <td>-WwwD</td> <td>-W436</td> <td>-Www-D</td> <td>-W43-6 </td></tr> <tr> <td>A specific day in the implied week</td> <td>-W-D</td> <td>-W-6</td> <td colspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">— </td></tr> <tr> <td>A specific minute and second of the implied hour</td> <td>-mmss</td> <td>-3456</td> <td>-mm:ss</td> <td>-34:56 </td></tr> <tr> <td>A specific second of the implied minute</td> <td>-ss</td> <td>-56</td> <td colspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">— </td></tr> <tr> <td>A specific minute and decimal fraction of the implied hour</td> <td>-mm,m</td> <td>-34,9</td> <td colspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">— </td></tr></tbody></table> <p>The first and seventh examples given above omit the leading <code>-</code> for century. Other formats have one leading <code>-</code> per omitted century, year, month, week, hour and minute as necessary to disambiguate the format. </p> <div class="mw-heading mw-heading2"><h2 id="Standardised_extensions">Standardised extensions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=20" title="Edit section: Standardised extensions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>ISO 8601-2:2019 defines a set of standardised extensions to the ISO 8601 date and time formats. </p> <dl><dt><span class="anchor" id="EDTF"></span> Extended Date/Time Format (EDTF)</dt> <dd>The EDTF is given as an example of a profile of ISO 8601. Some of its features are:<sup id="cite_ref-EDTF_2019_Spec_9-1" class="reference"><a href="#cite_note-EDTF_2019_Spec-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> <ul><li><a href="/wiki/Uncertainty" title="Uncertainty">Uncertain</a> and approximate qualifiers, '?' and '~', as well as their combined used, '%'; they can be applied to the whole date or to individual components.</li> <li>Time intervals with an open (unbounded) end or an unknown end.</li> <li>Exponential and significant figure notation in years.</li> <li>Special "month" values indicating sub-year groupings such as seasons and quarters.</li> <li>Syntax for serializing a list of dates.</li></ul></dd> <dd>The EDTF features are described in the "Date and Time Extensions" section of ISO 8601-2:2019.</dd></dl> <dl><dt>Repeat rules for recurring time intervals</dt> <dd>ISO 8601-2:2019 also defines a format to constrain repeating intervals based on syntax from <a href="/wiki/ICalendar" title="ICalendar">iCalendar</a>.</dd></dl> <div class="mw-heading mw-heading2"><h2 id="Usage">Usage</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=21" title="Edit section: Usage"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On the <a href="/wiki/Internet" title="Internet">Internet</a>, the <a href="/wiki/World_Wide_Web_Consortium" title="World Wide Web Consortium">World Wide Web Consortium</a> (W3C) uses the <a href="/wiki/IETF" class="mw-redirect" title="IETF">IETF</a> standard based on ISO 8601 in defining a profile of the standard that restricts the supported date and time formats to reduce the chance of error and the complexity of software. The very simple specification is based on a draft of the RFC 3339 mentioned below.<sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> </p><p>ISO 8601 is referenced by several specifications, but the full range of options of ISO 8601 is not always used. For example, the various <a href="/wiki/Electronic_program_guide" title="Electronic program guide">electronic program guide</a> standards for TV, digital radio, etc. use several forms to describe points in time and durations. The <a href="/wiki/ID3" title="ID3">ID3</a> audio meta-data specification also makes use of a subset of ISO 8601.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> The <a href="/wiki/X.690" title="X.690">X.690</a> encoding standard's <a href="/wiki/GeneralizedTime" title="GeneralizedTime">GeneralizedTime</a> makes use of another subset of ISO 8601. </p> <div class="mw-heading mw-heading3"><h3 id="Commerce">Commerce</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=22" title="Edit section: Commerce"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As of 2006, the <a href="/wiki/ISO_week_date" title="ISO week date">ISO week date</a> appears in its basic form on major brand commercial packaging in the United States.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (March 2023)">citation needed</span></a></i>]</sup> Its appearance depended on the particular packaging, canning, or bottling plant more than any particular brand. The format is particularly useful for quality assurance, so that production errors can be readily traced. </p> <div class="mw-heading mw-heading3"><h3 id="RFCs">RFCs</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=23" title="Edit section: RFCs"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>IETF RFC 3339<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> defines a profile of ISO 8601 for use in <a href="/wiki/Internet_protocol_suite" title="Internet protocol suite">Internet protocols</a> and <a href="/wiki/Internet_standard" class="mw-redirect" title="Internet standard">standards</a>. It explicitly excludes durations and dates before the <a href="/wiki/Common_era" class="mw-redirect" title="Common era">common era</a>. The more complex formats such as week numbers and ordinal days are not permitted.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> </p><p>RFC 3339 deviates from ISO 8601 in allowing a zero time zone offset to be specified as "-00:00", which ISO 8601 forbids. RFC 3339 intends "-00:00" to carry the connotation that it is not stating a preferred time zone, whereas the conforming "+00:00" or any non-zero offset connotes that the offset being used is preferred. This convention regarding "-00:00" is derived from earlier RFCs, such as RFC 2822 which uses it for timestamps in <a href="/wiki/Email" title="Email">email</a> headers.<sup id="cite_ref-49" class="reference"><a href="#cite_note-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> RFC 2822 made no claim that any part of its timestamp format conforms to ISO 8601, and so was free to use this convention without conflict. </p><p>Building upon the foundations of RFC 3339, the <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a> introduced the Internet Extended Date/Time Format (IXDTF) in RFC 9557.<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> This format extends the timestamp representation to include additional information such as an associated time zone name. The inclusion of time zone names is particularly useful for applications that need to account for events like daylight saving time transitions. Furthermore, IXDTF maintains compatibility with pre-existing syntax for attaching time zone names to timestamps, providing a standardized and flexible approach to timestamp representation on the internet. Example: </p><p><code>1996-12-19T16:39:57-08:00[America/Los_Angeles]</code> </p> <div class="mw-heading mw-heading3"><h3 id="Adoption_as_national_standards">Adoption as national standards</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=24" title="Edit section: Adoption as national standards"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable"> <tbody><tr> <th style="text-align:left">Australia </th> <td>AS/NZS ISO 8601.1:2021, AS/NZS ISO 8601.2:2021 (replaced AS ISO 8601-2007) </td></tr> <tr> <th style="text-align:left">Austria </th> <td>ÖNORM ISO 8601 (replaced ÖNORM EN 28601) </td></tr> <tr> <th style="text-align:left">Belgium </th> <td>NBN EN 28601 (1993) </td></tr> <tr> <th style="text-align:left">Brazil </th> <td>NBR 5892:2019 </td></tr> <tr> <th style="text-align:left">Canada </th> <td>CAN/CSA-Z234.4-89 (R2007)<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <th style="text-align:left">Colombia </th> <td>NTC 1034:2014 <a rel="nofollow" class="external text" href="https://tienda.icontec.org/gp-elementos-de-datos-y-formatos-de-intercambio-intercambio-de-informacion-representacion-de-fechas-y-horas-ntc1034-2014.html">Source ICONTEC (This standard is identical to ISO 8601:2004)</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200116023212/https://tienda.icontec.org/wp-content/uploads/pdfs/NTC1034.pdf">Archived</a> 2020-01-16 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> </td></tr> <tr> <th style="text-align:left">China </th> <td>GB/T 7408-2005 </td></tr> <tr> <th style="text-align:left">Czech Republic </th> <td>ČSN ISO 8601 (replaced ČSN EN 28601) (Obsolete as of 2019. No standard was given in exchange.<sup id="cite_ref-52" class="reference"><a href="#cite_note-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup>) </td></tr> <tr> <th style="text-align:left">Denmark </th> <td>DS/ISO 8601:2005 (replaced DS/EN 28601) </td></tr> <tr> <th style="text-align:left">Estonia </th> <td>EVS 8:2008; EVS-ISO 8601:2011 </td></tr> <tr> <th style="text-align:left"><a href="/wiki/European_Norm" class="mw-redirect" title="European Norm">European Norm</a> </th> <td>EN ISO 8601, EN 28601:1992 (cancelled 7 October 2011) </td></tr> <tr> <th style="text-align:left">Finland </th> <td>SFS-EN 28601 </td></tr> <tr> <th style="text-align:left">France </th> <td>NF Z69-200; NF EN 28601:1993-06-01 (cancelled) </td></tr> <tr> <th style="text-align:left">Germany </th> <td>DIN ISO 8601:2006-09 (replaced DIN EN 28601:1993-02); related: DIN 5008:2011-04 (replaced DIN 5008:2005-05, DIN 5008:2001-11, DIN 5008:1996-05) </td></tr> <tr> <th style="text-align:left">Greece </th> <td>ELOT EN 28601 </td></tr> <tr> <th style="text-align:left">Hungary </th> <td>MSZ ISO 8601:2003 </td></tr> <tr> <th style="text-align:left">Iceland </th> <td>IST EN 28601:1992 (obsolete) </td></tr> <tr> <th style="text-align:left"><a href="/wiki/India" title="India">India</a> </th> <td>IS 7900:2001 </td></tr> <tr> <th style="text-align:left">Ireland </th> <td>IS/EN 28601:1993 </td></tr> <tr> <th style="text-align:left">Italy </th> <td>UNI EN 28601 (1993) </td></tr> <tr> <th style="text-align:left">Japan </th> <td>JIS X 0301:2002 </td></tr> <tr> <th style="text-align:left">Korea, Republic of </th> <td>KS X ISO 8601 </td></tr> <tr> <th style="text-align:left">Lithuania </th> <td>LST ISO 8601:2006 (replaced LST ISO 8601:1997) </td></tr> <tr> <th style="text-align:left">Luxembourg </th> <td>ITM-EN 28601 </td></tr> <tr> <th style="text-align:left">Mexico </th> <td>NMX-CH-150-IMNC-1999<sup id="cite_ref-53" class="reference"><a href="#cite_note-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <th style="text-align:left">Netherlands </th> <td>NEN ISO 8601, NEN EN 28601 (1994), NEN 2772 </td></tr> <tr> <th style="text-align:left">New Zealand </th> <td>AS/NZS ISO 8601.1:2021, AS/NZS ISO 8601.2:2021 </td></tr> <tr> <th style="text-align:left">Norway </th> <td>NS-ISO 8601 </td></tr> <tr> <th style="text-align:left">Poland </th> <td>PN-EN 28601:2002 (Obsolete as of 2008. No standard was given in exchange.<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup>) </td></tr> <tr> <th style="text-align:left">Portugal </th> <td>NP EN 28601 </td></tr> <tr> <th style="text-align:left">Russia </th> <td>ГОСТ ИСО 8601-2001 (current), ГОСТ 7.64-90 (obsolete) </td></tr> <tr> <th style="text-align:left">South Africa </th> <td>SANS 8601:2009<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <th style="text-align:left">Spain </th> <td>UNE EN 28601:1995 </td></tr> <tr> <th style="text-align:left">Sweden </th> <td>SS-ISO 8601-1:2022,<sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> contains the official English version of ISO 8601-1:2019. (Approved 2022-05-13, replaces SS-ISO 8601:2011, edition 2) </td></tr> <tr> <th style="text-align:left">Switzerland </th> <td>SN ISO 8601:2005-08 (replaced SN-EN 28601:1994) </td></tr> <tr> <th style="text-align:left">Taiwan </th> <td>CNS 7648 </td></tr> <tr> <th style="text-align:left">Thailand </th> <td>TIS 1111:2535 (1992) </td></tr> <tr> <th style="text-align:left"><a href="/wiki/Turkey" title="Turkey">Turkey</a> </th> <td><a rel="nofollow" class="external text" href="https://intweb.tse.org.tr/Standard/Standard/Standard.aspx?081118051115108051104119110104055047105102120088111043113104073099090081121118054048055097110084">TS ISO 8601-1</a> and <a rel="nofollow" class="external text" href="https://intweb.tse.org.tr/Standard/Standard/Standard.aspx?081118051115108051104119110104055047105102120088111043113104073088120070088100073077122088115098">TS ISO 8601-2</a> (Accepted from 2021-02-15) </td></tr> <tr> <th style="text-align:left">Ukraine </th> <td>ДСТУ ISO 8601:2010 </td></tr> <tr> <th style="text-align:left">United Kingdom </th> <td>BS ISO 8601:2004, BS EN 28601 (1989-06-30) </td></tr> <tr> <th style="text-align:left">United States </th> <td>ANSI INCITS 30-1997 (R2008) and NIST FIPS PUB 4-2 </td></tr> <tr> <th style="text-align:left">Vietnam </th> <td><a rel="nofollow" class="external text" href="https://thuvienphapluat.vn/TCVN/linh-vuc-khac/tcvn-6398-1-1998-dai-luong-va-don-vi-khong-gian-va-thoi-gian-907037.aspx">TCVN 6398-1:1998</a> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=25" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Astronomical_year_numbering" title="Astronomical year numbering">Astronomical year numbering</a></li> <li><a href="/wiki/Date_and_time_representation_by_country" title="Date and time representation by country">Date and time representation by country</a></li> <li><a href="/wiki/Date_format_by_country" class="mw-redirect" title="Date format by country">Date format by country</a></li> <li><a href="/wiki/Horology" class="mw-redirect" title="Horology">Horology</a></li> <li><a href="https://en.wikiversity.org/wiki/ISO_8601_and_computing_differences_between_dates" class="extiw" title="v:ISO 8601 and computing differences between dates">ISO 8601 and computing differences between dates</a> on <a href="/wiki/Wikiversity" title="Wikiversity">Wikiversity</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Notes_and_references">Notes and references</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=ISO_8601&action=edit&section=26" title="Edit section: Notes and references"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-iso8601amd1-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-iso8601amd1_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-iso8601amd1_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-iso8601amd1_1-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation cs2"><i>ISO 8601-1:2019/Amd 1:2022</i>, <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, 2022-10-25</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601-1%3A2019%2FAmd+1%3A2022&rft.pub=ISO&rft.date=2022-10-25&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-scope-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-scope_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-scope_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">ISO 8601:2004[E] section 1 Scope</span> </li> <li id="cite_note-doc2004-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-doc2004_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-doc2004_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><i>ISO 8601:2004(E)</i>, <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, 2004-12-01, <q>Annex A: ... From that concept representations of all other date and time values were logically derived; thus, ISO 2014, ISO 3307 and ISO 4031 have been superseded. ... Identification of a particular date by means of ordinal dates (ISO 2711) and by means of the week numbering system (ISO 2015) were alternative methods that the basic concept of this International Standard could also encompass; thus, ISO 2015 and ISO 2711 have now been superseded.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601%3A2004%28E%29&rft.pub=ISO&rft.date=2004-12-01&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><i>ISO 8601:2004(E)</i>. <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>. 2004-12-01. p. iv Foreword.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601%3A2004%28E%29&rft.pages=p.-iv+Foreword&rft.pub=ISO&rft.date=2004-12-01&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.iso.org/iso/home/store/catalogue_tc/catalogue_tc_browse.htm?commid=53186&published=on">"TC 154 Processes, data elements and documents in commerce, industry and administration"</a>. Technical committees. ISO. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160525114524/http://www.iso.org/iso/home/store/catalogue_tc/catalogue_tc_browse.htm?commid=53186&published=on">Archived</a> from the original on 2016-05-25<span class="reference-accessdate">. Retrieved <span class="nowrap">2014-08-16</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=TC+154+Processes%2C+data+elements+and+documents+in+commerce%2C+industry+and+administration&rft.pub=ISO&rft_id=http%3A%2F%2Fwww.iso.org%2Fiso%2Fhome%2Fstore%2Fcatalogue_tc%2Fcatalogue_tc_browse.htm%3Fcommid%3D53186%26published%3Don&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.isotc154.org/posts/2019-08-27-introduction-to-the-new-8601/">"Introduction to the new ISO 8601-1 and ISO 8601-2"</a>. <i>ISO/TC 154</i>. 26 August 2019.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=ISO%2FTC+154&rft.atitle=Introduction+to+the+new+ISO+8601-1+and+ISO+8601-2&rft.date=2019-08-26&rft_id=https%3A%2F%2Fwww.isotc154.org%2Fposts%2F2019-08-27-introduction-to-the-new-8601%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171019211402/https://www.loc.gov/standards/datetime/ISO_DIS%208601-1.pdf">"ISO/DIS 8601-1:2016-10-26"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/Library_of_Congress" title="Library of Congress">Library of Congress</a></i>. Archived from <a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/ISO_DIS%208601-1.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-10-19.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Library+of+Congress&rft.atitle=ISO%2FDIS+8601-1%3A2016-10-26&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2FISO_DIS%25208601-1.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.din.de/de/mitwirken/normenausschuesse/nia/entwuerfe/wdc-beuth:din21:266843241">"German draft <i>E DIN ISO 8601-1:2017-02 Datenelemente und Austauschformate - Informationsaustausch - Darstellung von Datum und Uhrzeit - Teil 1: Grundlegende Regeln (ISO/DIS 8601-1:2016)</i>"</a>. DIN-Normenausschuss Informationstechnik und Anwendungen (NIA). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171020151006/https://www.din.de/de/mitwirken/normenausschuesse/nia/entwuerfe/wdc-beuth:din21:266843241">Archived</a> from the original on 2017-10-20<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-10-19</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=German+draft+E+DIN+ISO+8601-1%3A2017-02+Datenelemente+und+Austauschformate+-+Informationsaustausch+-+Darstellung+von+Datum+und+Uhrzeit+-+Teil+1%3A+Grundlegende+Regeln+%28ISO%2FDIS+8601-1%3A2016%29&rft.pub=DIN-Normenausschuss+Informationstechnik+und+Anwendungen+%28NIA%29&rft_id=https%3A%2F%2Fwww.din.de%2Fde%2Fmitwirken%2Fnormenausschuesse%2Fnia%2Fentwuerfe%2Fwdc-beuth%3Adin21%3A266843241&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-EDTF_2019_Spec-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-EDTF_2019_Spec_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-EDTF_2019_Spec_9-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/">"Extended Date/Time Format (EDTF) Specification"</a>. <a href="/wiki/The_Library_of_Congress" class="mw-redirect" title="The Library of Congress">The Library of Congress</a>. 2019-10-08 [2019-02-04, 2014, 2012]. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200307193917/https://www.loc.gov/standards/datetime/">Archived</a> from the original on 2020-03-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2020-03-07</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Extended+Date%2FTime+Format+%28EDTF%29+Specification&rft.pub=The+Library+of+Congress&rft.date=2019-10-08&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-EDTF_2019_Background-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-EDTF_2019_Background_10-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/background.html">"Extended Date/Time Format (EDTF) Background"</a>. <a href="/wiki/The_Library_of_Congress" class="mw-redirect" title="The Library of Congress">The Library of Congress</a>. 2019-10-08 [2019-03-01]. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20200307193911/https://www.loc.gov/standards/datetime/background.html">Archived</a> from the original on 2020-03-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2020-03-07</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Extended+Date%2FTime+Format+%28EDTF%29+Background&rft.pub=The+Library+of+Congress&rft.date=2019-10-08&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2Fbackground.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-EDTF_2014-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-EDTF_2014_11-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20170715194139/http://www.loc.gov/standards/datetime/pre-submission.html">"Extended Date/Time Format (EDTF) 1.0 2012/2014"</a>. Draft Submission. <a href="/wiki/The_Library_of_Congress" class="mw-redirect" title="The Library of Congress">The Library of Congress</a>. Archived from <a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/pre-submission.html">the original</a> on 2017-07-15<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-07-15</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Extended+Date%2FTime+Format+%28EDTF%29+1.0+2012%2F2014&rft.series=Draft+Submission&rft.pub=The+Library+of+Congress&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2Fpre-submission.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171019222039/https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0039_iso_wd_8601-2_2016-02-16.pdf">"ISO/WD 8601-2:2016-02-16"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/Library_of_Congress" title="Library of Congress">Library of Congress</a></i>. Archived from <a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0039_iso_wd_8601-2_2016-02-16.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-10-19.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Library+of+Congress&rft.atitle=ISO%2FWD+8601-2%3A2016-02-16&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2Fiso-tc154-wg5_n0039_iso_wd_8601-2_2016-02-16.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171020000043/https://www.loc.gov/standards/datetime/ISO_DIS%208601-2.pdf">"ISO/DIS 8601-2:2016-10-26"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/Library_of_Congress" title="Library of Congress">Library of Congress</a></i>. Archived from <a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/ISO_DIS%208601-2.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-10-20.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Library+of+Congress&rft.atitle=ISO%2FDIS+8601-2%3A2016-10-26&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2FISO_DIS%25208601-2.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.din.de/de/mitwirken/normenausschuesse/nia/entwuerfe/wdc-beuth:din21:266843381">"German draft <i>E DIN ISO 8601-2:2017-02 Datenelemente und Austauschformate - Informationsaustausch - Darstellung von Datum und Uhrzeit - Teil 2: Erweiterungen (ISO/DIS 8601-2:2016)</i>"</a>. DIN-Normenausschuss Informationstechnik und Anwendungen (NIA). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171019230355/https://www.din.de/de/mitwirken/normenausschuesse/nia/entwuerfe/wdc-beuth:din21:266843381">Archived</a> from the original on 2017-10-19<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-10-19</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=German+draft+E+DIN+ISO+8601-2%3A2017-02+Datenelemente+und+Austauschformate+-+Informationsaustausch+-+Darstellung+von+Datum+und+Uhrzeit+-+Teil+2%3A+Erweiterungen+%28ISO%2FDIS+8601-2%3A2016%29&rft.pub=DIN-Normenausschuss+Informationstechnik+und+Anwendungen+%28NIA%29&rft_id=https%3A%2F%2Fwww.din.de%2Fde%2Fmitwirken%2Fnormenausschuesse%2Fnia%2Fentwuerfe%2Fwdc-beuth%3Adin21%3A266843381&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-isofaqtnd-15"><span class="mw-cite-backlink">^ <a href="#cite_ref-isofaqtnd_15-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-isofaqtnd_15-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">ISO: "<a rel="nofollow" class="external text" href="http://www.iso.org/iso/iso8601">ISO 8601 — Date and time format</a>". <a rel="nofollow" class="external text" href="https://web.archive.org/web/20130308153102/http://www.iso.org/iso/iso8601">Archived</a> 2013-03-08 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWolfWicksteed1997" class="citation web cs1">Wolf, Misha; Wicksteed, Charles (15 September 1997). <a rel="nofollow" class="external text" href="https://www.w3.org/TR/NOTE-datetime">"Date and Time Formats"</a>. <i><a href="/wiki/W3.org" class="mw-redirect" title="W3.org">W3C</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210510231523/https://www.w3.org/TR/NOTE-datetime">Archived</a> from the original on 10 May 2021<span class="reference-accessdate">. Retrieved <span class="nowrap">11 May</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=W3C&rft.atitle=Date+and+Time+Formats&rft.date=1997-09-15&rft.aulast=Wolf&rft.aufirst=Misha&rft.au=Wicksteed%2C+Charles&rft_id=https%3A%2F%2Fwww.w3.org%2FTR%2FNOTE-datetime&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text">ISO 8601:2004 section 2.3.3 basic format</span> </li> <li id="cite_note-AccuracyVsPrecision-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-AccuracyVsPrecision_18-0">^</a></b></span> <span class="reference-text">Earlier versions of ISO 8601 used the word <i>accuracy</i>, not <i>precision</i>, in the relevant section, e.g: 2.3.7 representation with reduced accuracy. This was corrected in ISO 8601-1:2019.</span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDoggett1992" class="citation book cs1">Doggett, L. E. (1992). "Calendars". In P. K. Seidelmann (ed.). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20040401234715/http://astro.nmsu.edu/~lhuber/leaphist.html"><i>Explanatory Supplement to the Astronomical Almanac</i></a>. Sausalito, California: University Science Books. p. 580. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-935702-68-7" title="Special:BookSources/0-935702-68-7"><bdi>0-935702-68-7</bdi></a>. Archived from <a rel="nofollow" class="external text" href="http://astro.nmsu.edu/~lhuber/leaphist.html">the original</a> on 2004-04-01. <q>The Gregorian calendar today serves as an international standard for civil use.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Calendars&rft.btitle=Explanatory+Supplement+to+the+Astronomical+Almanac&rft.place=Sausalito%2C+California&rft.pages=580&rft.pub=University+Science+Books&rft.date=1992&rft.isbn=0-935702-68-7&rft.aulast=Doggett&rft.aufirst=L.+E.&rft_id=http%3A%2F%2Fastro.nmsu.edu%2F~lhuber%2Fleaphist.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><i>ISO 8601:2004(E)</i>. <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>. 2004-12-01. section 4.1.2.1 General.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601%3A2004%28E%29&rft.pages=section+4.1.2.1+General&rft.pub=ISO&rft.date=2004-12-01&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><i>ISO 8601:2004(E)</i>. <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>. 2004-12-01. <q>3.5 Expansion ... By mutual agreement of the partners in information interchange, it is permitted to expand the component identifying the calendar year, which is otherwise limited to four digits. This enables reference to dates and times in calendar years outside the range supported by complete representations, i.e. before the start of the year [0000] or after the end of the year [9999].</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601%3A2004%28E%29&rft.pub=ISO&rft.date=2004-12-01&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-22">^</a></b></span> <span class="reference-text">ISO 8601:2004 sections 3.4.2, 4.1.2.4</span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text">For example, see Annex B.1.1 of the standard.</span> </li> <li id="cite_note-datewithoutyear-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-datewithoutyear_24-0">^</a></b></span> <span class="reference-text">last in ISO 8601:2000, in use by <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPerreault2011" class="citation cs1">Perreault, S. (August 2011). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6350#section-4.3.1">"DATE"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6350"><i>vCard Format Specification</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. sec. 4.3.1. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC6350">10.17487/RFC6350</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6350">6350</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2021-01-21</span></span>. <q>Truncated representation, as specified in [ISO.8601.2000], Sections 5.2.1.3 d), e), and f), is permitted.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=DATE&rft.btitle=vCard+Format+Specification&rft.pages=sec.-4.3.1&rft.pub=IETF&rft.date=2011-08&rft_id=info%3Adoi%2F10.17487%2FRFC6350&rft.aulast=Perreault&rft.aufirst=S.&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc6350%26%23035%3Bsection-4.3.1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span>, although removed in ISO 8601:2004</span> </li> <li id="cite_note-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-25">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFPerreault2011" class="citation cs1">Perreault, S. (August 2011). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6350#section-4.3.1">"DATE"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6350"><i>vCard Format Specification</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. sec. 4.3.1. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC6350">10.17487/RFC6350</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc6350">6350</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-06-29</span></span>. <q>Truncated representation, as specified in [ISO.8601.2000], Sections 5.2.1.3 d), e), and f), is permitted.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=DATE&rft.btitle=vCard+Format+Specification&rft.pages=sec.-4.3.1&rft.pub=IETF&rft.date=2011-08&rft_id=info%3Adoi%2F10.17487%2FRFC6350&rft.aulast=Perreault&rft.aufirst=S.&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc6350%26%23035%3Bsection-4.3.1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-26"><span class="mw-cite-backlink"><b><a href="#cite_ref-26">^</a></b></span> <span class="reference-text">ISO 8601-1:2019 section 5.3.1.3 Representations with reduced precision</span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-27">^</a></b></span> <span class="reference-text">ISO 8601-1:2019 section 3.1.3.9 Decimal sign</span> </li> <li id="cite_note-28"><span class="mw-cite-backlink"><b><a href="#cite_ref-28">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><i>ISO 8601:2004(E)</i>, <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>, 2004-12-01, <q>4.2.2.4 ... the decimal fraction shall be divided from the integer part by the decimal sign specified in ISO 31-0, i.e. the comma [,] or full stop [.]. Of these, the comma is the preferred sign.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601%3A2004%28E%29&rft.pub=ISO&rft.date=2004-12-01&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><b><a href="#cite_ref-29">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://docs.microsoft.com/en-us/previous-versions/sql/sql-server-2005/ms190977(v=sql.90)">"ISO 8601 Format"</a>. <a href="/wiki/Microsoft_TechNet" title="Microsoft TechNet">TechNet</a>. <i><a href="/wiki/Microsoft_Docs" title="Microsoft Docs">Microsoft Docs</a></i>. 3 December 2008. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20211020172442/https://docs.microsoft.com/en-us/previous-versions/sql/sql-server-2005/ms190977(v=sql.90)">Archived</a> from the original on 2021-10-20<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-10-20</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Microsoft+Docs&rft.atitle=ISO+8601+Format&rft.date=2008-12-03&rft_id=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fprevious-versions%2Fsql%2Fsql-server-2005%2Fms190977%28v%3Dsql.90%29&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-30"><span class="mw-cite-backlink"><b><a href="#cite_ref-30">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMarkus_Kuhn2020" class="citation web cs1">Markus Kuhn (2020-06-16). <a rel="nofollow" class="external text" href="https://www.cl.cam.ac.uk/~mgk25/iso-time.html">"A summary of the international standard date and time notation"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20221005210715/https://www.cl.cam.ac.uk/~mgk25/iso-time.html">Archived</a> from the original on 2022-10-05<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-10-05</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=A+summary+of+the+international+standard+date+and+time+notation&rft.date=2020-06-16&rft.au=Markus+Kuhn&rft_id=https%3A%2F%2Fwww.cl.cam.ac.uk%2F~mgk25%2Fiso-time.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-ACP_121_I-31"><span class="mw-cite-backlink"><b><a href="#cite_ref-ACP_121_I_31-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://rnzncomms.files.wordpress.com/2016/10/acp121_i_2010.pdf">"Communication Instructions General ACP 121(I)"</a> <span class="cs1-format">(PDF)</span>. <a href="/wiki/Combined_Communications_Electronics_Board" class="mw-redirect" title="Combined Communications Electronics Board">Combined Communications Electronics Board</a>. October 2010. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180116081251/https://rnzncomms.files.wordpress.com/2016/10/acp121_i_2010.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2018-01-16<span class="reference-accessdate">. Retrieved <span class="nowrap">2018-01-15</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Communication+Instructions+General+ACP+121%28I%29&rft.pub=Combined+Communications+Electronics+Board&rft.date=2010-10&rft_id=https%3A%2F%2Frnzncomms.files.wordpress.com%2F2016%2F10%2Facp121_i_2010.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-32"><span class="mw-cite-backlink"><b><a href="#cite_ref-32">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMcCarthySeidelmann2009" class="citation book cs1"><a href="/wiki/Dennis_D._McCarthy" class="mw-redirect" title="Dennis D. McCarthy">McCarthy, Dennis D.</a>; Seidelmann, Kenneth P. (2009). <i>Time: From Earth Rotation to Atomic Physics</i>. Weinheim: <a href="/wiki/Wiley-VCH_Verlag_GmbH_%26_Co._KGaA" class="mw-redirect" title="Wiley-VCH Verlag GmbH & Co. KGaA">Wiley-VCH Verlag GmbH & Co. KGaA</a>. p. 10. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-3-527-40780-4" title="Special:BookSources/978-3-527-40780-4"><bdi>978-3-527-40780-4</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Time%3A+From+Earth+Rotation+to+Atomic+Physics&rft.place=Weinheim&rft.pages=10&rft.pub=Wiley-VCH+Verlag+GmbH+%26+Co.+KGaA&rft.date=2009&rft.isbn=978-3-527-40780-4&rft.aulast=McCarthy&rft.aufirst=Dennis+D.&rft.au=Seidelmann%2C+Kenneth+P.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-33"><span class="mw-cite-backlink"><b><a href="#cite_ref-33">^</a></b></span> <span class="reference-text">ISO 8601-1:2019 section 3.2.4, ISO 8601:2004 section 3.4.2</span> </li> <li id="cite_note-34"><span class="mw-cite-backlink"><b><a href="#cite_ref-34">^</a></b></span> <span class="reference-text">RFC 3339 – Unknown local offset convention</span> </li> <li id="cite_note-35"><span class="mw-cite-backlink"><b><a href="#cite_ref-35">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNewman2002" class="citation cs1">Newman, Chris (July 2002). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339#section-4.3">"Unknown Local Offset Convention"</a>. In Klyne, Graham (ed.). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339"><i>Date and Time on the Internet:Timestamps</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. sec. 4.3. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC3339">10.17487/RFC3339</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339">3339</a><span class="reference-accessdate">. Retrieved <span class="nowrap">1 February</span> 2021</span>. <q>If the time in UTC is known, but the offset to local time is unknown, this can be represented with an offset of "-00:00". This differs semantically from an offset of "Z" or "+00:00", which imply that UTC is the preferred reference point for the specified time. RFC2822 [IMAIL-UPDATE] describes a similar convention for email</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Unknown+Local+Offset+Convention&rft.btitle=Date+and+Time+on+the+Internet%3ATimestamps&rft.pages=sec.-4.3&rft.pub=IETF&rft.date=2002-07&rft_id=info%3Adoi%2F10.17487%2FRFC3339&rft.aulast=Newman&rft.aufirst=Chris&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc3339%26%23035%3Bsection-4.3&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-36"><span class="mw-cite-backlink"><b><a href="#cite_ref-36">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs1">"3.4.1 Characters used in the representations - Introduction". <a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf"><i>Data elements and interchange formats — Information interchange - Representation of dates and times — Part 1: Basic rules</i></a> <span class="cs1-format">(PDF)</span> (pdf). <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>. 2016-02-16. p. 12. ISO/WD 8601-1. <a rel="nofollow" class="external text" href="https://archive.today/20221005210840/https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2022-10-05. <q>In an environment where use is made of a character repertoire based on ISO/IEC 646, "hyphen" and "minus" are both mapped onto "hyphen-minus". Representations with a "plus-minus" shall only be used in such environment if the interchange repertoire includes "plus-minus"<span class="cs1-kern-right"></span></q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=3.4.1+Characters+used+in+the+representations+-+Introduction&rft.btitle=Data+elements+and+interchange+formats+%E2%80%94+Information+interchange+-+Representation+of+dates+and+times+%E2%80%94+Part+1%3A+Basic+rules&rft.pages=12&rft.pub=ISO&rft.date=2016-02-16&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2Fiso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-37"><span class="mw-cite-backlink"><b><a href="#cite_ref-37">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><i>ISO 8601:2004(E): Data elements and interchange formats — Information interchange — Representation of dates and times</i>. <a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a>. 2004-12-01. <q>4.3.2 NOTE: By mutual agreement of the partners in information interchange, the character [T] may be omitted in applications where there is no risk of confusing a date and time of day representation with others defined in this International Standard.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ISO+8601%3A2004%28E%29%3A+Data+elements+and+interchange+formats+%E2%80%94+Information+interchange+%E2%80%94+Representation+of+dates+and+times&rft.pub=ISO&rft.date=2004-12-01&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><b><a href="#cite_ref-38">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFG._KlyneC._Newman2002" class="citation cs1">G. Klyne; C. Newman (July 2002). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339#section-5.6">"Internet Date/Time Format"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339"><i>Date and Time on the Internet: Timestamps</i></a>. sec. 5.6. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC3339">10.17487/RFC3339</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339">3339</a>. <q>NOTE: ISO 8601 defines date and time separated by "T". Applications using this syntax may choose, for the sake of readability, to specify a full-date and full-time separated by (say) a space character.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Internet+Date%2FTime+Format&rft.btitle=Date+and+Time+on+the+Internet%3A+Timestamps&rft.pages=sec.-5.6&rft.date=2002-07&rft_id=info%3Adoi%2F10.17487%2FRFC3339&rft.au=G.+Klyne&rft.au=C.+Newman&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc3339%26%23035%3Bsection-5.6&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-39"><span class="mw-cite-backlink"><b><a href="#cite_ref-39">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.loc.gov/standards/datetime/iso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf">"Data elements and interchange formats — Information interchange - Representation of dates and times — Part 1: Basic rules"</a> <span class="cs1-format">(PDF)</span>. <i>The Library of Congress</i>. p. 23. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210312212543/http://www.loc.gov/standards/datetime/iso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2021-03-12<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-07-06</span></span>. <q>b) If necessary for a particular application, the lowest order components may have a decimal fraction.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=The+Library+of+Congress&rft.atitle=Data+elements+and+interchange+formats+%E2%80%94+Information+interchange+-+Representation+of+dates+and+times+%E2%80%94+Part+1%3A+Basic+rules&rft.pages=23&rft_id=https%3A%2F%2Fwww.loc.gov%2Fstandards%2Fdatetime%2Fiso-tc154-wg5_n0038_iso_wd_8601-1_2016-02-16.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-40"><span class="mw-cite-backlink"><b><a href="#cite_ref-40">^</a></b></span> <span class="reference-text">ISO 8601:2004 section 4.4.3.3 Alternative format, ISO 8601-1:2019 section 5.5.2.4 Alternative format</span> </li> <li id="cite_note-41"><span class="mw-cite-backlink"><b><a href="#cite_ref-41">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html#parse-java.lang.CharSequence-">"Java 8 Class Duration"</a>. <i>Java Platform Standard Edition 8</i>. 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Retrieved <span class="nowrap">2015-10-25</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Date+and+Time+on+the+Internet%3A+Timestamps&rft.pub=IETF&rft.date=2002-07&rft_id=info%3Adoi%2F10.17487%2FRFC3339&rft.aulast=Newman&rft.aufirst=Chris&rft.au=Klyne%2C+Graham&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc3339&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-48"><span class="mw-cite-backlink"><b><a href="#cite_ref-48">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFNewmanKlyne2002" class="citation cs1">Newman, Chris; Klyne, Graham (July 2002). <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339#section-5.6">"Internet Date/Time Format"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339"><i>Date and Time on the Internet: Timestamps</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. p. 8. sec. 5.6. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.17487%2FRFC3339">10.17487/RFC3339</a></span>. <a href="/wiki/Request_for_Comments" title="Request for Comments">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3339">3339</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2015-10-25</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Internet+Date%2FTime+Format&rft.btitle=Date+and+Time+on+the+Internet%3A+Timestamps&rft.pages=p.-8.-sec.-5.6&rft.pub=IETF&rft.date=2002-07&rft_id=info%3Adoi%2F10.17487%2FRFC3339&rft.aulast=Newman&rft.aufirst=Chris&rft.au=Klyne%2C+Graham&rft_id=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Frfc3339%26%23035%3Bsection-5.6&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-49"><span class="mw-cite-backlink"><b><a href="#cite_ref-49">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs1"><a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2822#section-3.3">"Date and Time Specification"</a>. <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc2822"><i>Internet Message Format</i></a>. <a href="/wiki/Internet_Engineering_Task_Force" title="Internet Engineering Task Force">IETF</a>. 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Retrieved <span class="nowrap">2023-04-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=%C4%8CSN+ISO+8601+%28979738%29+Datov%C3%A9+prvky+a+form%C3%A1ty+v%C3%BDm%C4%9Bny+-+V%C3%BDm%C4%9Bna+informac%C3%AD+-+Zobrazen%C3%AD+data+a+%C4%8Dasu&rft.date=2023-04-17&rft_id=https%3A%2F%2Fwww.technicke-normy-csn.cz%2Fcsn-iso-8601-979738-241001.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AISO+8601" class="Z3988"></span></span> </li> <li id="cite_note-53"><span class="mw-cite-backlink"><b><a href="#cite_ref-53">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://dof.gob.mx/nota_detalle_popup.php?codigo=2052016">"DOF - Diario Oficial de la Federación"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20211110203252/http://dof.gob.mx/nota_detalle_popup.php?codigo=2052016">Archived</a> from the original on 2021-11-10<span class="reference-accessdate">. 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data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:ISO_8601" class="extiw" title="commons:Category:ISO 8601">ISO 8601</a></span>.</div></div> </div> <ul><li><a rel="nofollow" class="external text" href="https://www.iso.org/standard/40874.html">ISO's catalog entry for ISO 8601:2004</a></li> <li><a rel="nofollow" class="external text" href="https://www.iso.org/obp/ui/#iso:std:iso:8601:-1:ed-1:v1:en">Preview of ISO 8601-1:2019</a> from ISO</li> <li><a rel="nofollow" class="external text" href="https://www.iso.org/obp/ui/#iso:std:iso:8601:-2:ed-1:v1:en">Preview of ISO 8601-2:2019</a> from ISO</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171020084445/https://www.loc.gov/standards/datetime/ISO_DIS%208601-1.pdf">The 2016 prototype of ISO 8601-1 (ISO/TC 154 N) (archived)</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171020085148/https://www.loc.gov/standards/datetime/ISO_DIS%208601-2.pdf">The 2016 prototype of ISO 8601-2 (ISO/TC 154 N) (archived)</a></li> <li><a rel="nofollow" class="external text" href="http://www.w3.org/QA/Tips/iso-date">Use international date format (ISO) – Quality Web Tips</a> The World Wide Web Consortium (W3C)</li> <li><a rel="nofollow" class="external text" href="http://www.cl.cam.ac.uk/~mgk25/iso-time.html">ISO 8601 summary</a> by Dr. Markus Kuhn from <a href="/wiki/Cambridge_University" class="mw-redirect" title="Cambridge University">Cambridge University</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110614235056/http://www.iso.org/iso/support/faqs/faqs_widely_used_standards/widely_used_standards_other/date_and_time_format.htm">Summary of 8601 by ISO</a> at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> (archived 2011-06-14)</li> <li><a rel="nofollow" class="external text" href="https://webspace.science.uu.nl/~gent0113/calendar/isocalendar.htm">The Mathematics of the ISO 8601 Calendar</a> from the website of R.H. van Gent of <a href="/wiki/Utrecht_University" title="Utrecht University">Utrecht University</a></li> <li><a rel="nofollow" class="external text" href="https://www.w3.org/TR/1998/NOTE-datetime-19980827">W3C "NOTE": Date and Time Formats</a>, specifying a profile of ISO 8601:1988</li> <li><a rel="nofollow" class="external text" href="https://ijmacd.github.io/rfc3339-iso8601/">RFC 3339 vs ISO 8601</a> — <a href="/wiki/Venn_diagram" title="Venn diagram">Venn diagram</a> illustrating the difference between the two standards.</li></ul> <p><b>Implementation overview</b> </p> <ul><li><a rel="nofollow" class="external text" href="http://www.qsl.net/g1smd/isoimp.htm">ISO 8601 Implementation Around The World (1998)</a></li></ul> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" 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.navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Time_measurement_and_standards" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Time_measurement_and_standards" title="Template:Time measurement and standards"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Time_measurement_and_standards" title="Template talk:Time measurement and standards"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Time_measurement_and_standards" title="Special:EditPage/Template:Time measurement and standards"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Time_measurement_and_standards" style="font-size:114%;margin:0 4em"><a href="/wiki/Time" title="Time">Time measurement</a> and <a href="/wiki/Time_standard" title="Time standard">standards</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><a href="/wiki/Chronometry" title="Chronometry">Chronometry</a></li> <li><a href="/wiki/Orders_of_magnitude_(time)" title="Orders of magnitude (time)">Orders of magnitude</a></li> <li><a href="/wiki/Time_metrology" class="mw-redirect" title="Time metrology">Metrology</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">International standards</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Coordinated_Universal_Time" title="Coordinated Universal Time">Coordinated Universal Time</a> <ul><li><a href="/wiki/UTC_offset" title="UTC offset">offset</a></li></ul></li> <li><a href="/wiki/Universal_Time" title="Universal Time">UT</a></li> <li><a href="/wiki/%CE%94T_(timekeeping)" title="ΔT (timekeeping)">ΔT</a></li> <li><a href="/wiki/DUT1" title="DUT1">DUT1</a></li> <li><a href="/wiki/International_Earth_Rotation_and_Reference_Systems_Service" title="International Earth Rotation and Reference Systems Service">International Earth Rotation and Reference Systems Service</a></li> <li><a href="/wiki/ISO_31-1" title="ISO 31-1">ISO 31-1</a></li> <li><a class="mw-selflink selflink">ISO 8601</a></li> <li><a href="/wiki/International_Atomic_Time" title="International Atomic Time">International Atomic Time</a></li> <li><a href="/wiki/12-hour_clock" title="12-hour clock">12-hour clock</a></li> <li><a href="/wiki/24-hour_clock" title="24-hour clock">24-hour clock</a></li> <li><a href="/wiki/Barycentric_Coordinate_Time" title="Barycentric Coordinate Time">Barycentric Coordinate Time</a></li> <li><a href="/wiki/Barycentric_Dynamical_Time" title="Barycentric Dynamical Time">Barycentric Dynamical Time</a></li> <li><a href="/wiki/Civil_time" title="Civil time">Civil time</a></li> <li><a href="/wiki/Daylight_saving_time" title="Daylight saving time">Daylight saving time</a></li> <li><a href="/wiki/Geocentric_Coordinate_Time" title="Geocentric Coordinate Time">Geocentric Coordinate Time</a></li> <li><a href="/wiki/International_Date_Line" title="International Date Line">International Date Line</a></li> <li><a href="/wiki/IERS_Reference_Meridian" title="IERS Reference Meridian">IERS Reference Meridian</a></li> <li><a href="/wiki/Leap_second" title="Leap second">Leap second</a></li> <li><a href="/wiki/Solar_time" title="Solar time">Solar time</a></li> <li><a href="/wiki/Terrestrial_Time" title="Terrestrial Time">Terrestrial Time</a></li> <li><a href="/wiki/Time_zone" title="Time zone">Time zone</a></li> <li><a href="/wiki/180th_meridian" title="180th meridian">180th meridian</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="9" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/Hourglass" title="Hourglass"><img alt="template illustration" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Marine_sandglass_MMM.jpg/75px-Marine_sandglass_MMM.jpg" decoding="async" width="75" height="175" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/70/Marine_sandglass_MMM.jpg/113px-Marine_sandglass_MMM.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/70/Marine_sandglass_MMM.jpg/150px-Marine_sandglass_MMM.jpg 2x" data-file-width="1637" data-file-height="3819" /></a></span><br /><span typeof="mw:File"><a href="/wiki/Time_zone" title="Time zone"><img alt="template illustration" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png/75px-Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png" decoding="async" width="75" height="152" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png/113px-Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png/150px-Aleutian_Islands_with_180th_meridian_and_International_Date_Line_%28cropped%29.png 2x" data-file-width="496" data-file-height="1007" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Obsolete standards</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ephemeris_time" title="Ephemeris time">Ephemeris time</a></li> <li><a href="/wiki/Greenwich_Mean_Time" title="Greenwich Mean Time">Greenwich Mean Time</a></li> <li><a href="/wiki/Prime_meridian" title="Prime meridian">Prime meridian</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Time_in_physics" title="Time in physics">Time in physics</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Absolute_space_and_time" title="Absolute space and time">Absolute space and time</a></li> <li><a href="/wiki/Spacetime" title="Spacetime">Spacetime</a></li> <li><a href="/wiki/Chronon" title="Chronon">Chronon</a></li> <li><a href="/wiki/Continuous_signal" class="mw-redirect" title="Continuous signal">Continuous signal</a></li> <li><a href="/wiki/Coordinate_time" title="Coordinate time">Coordinate time</a></li> <li><a href="/wiki/Cosmological_decade" title="Cosmological decade">Cosmological decade</a></li> <li><a href="/wiki/Discrete_time_and_continuous_time" title="Discrete time and continuous time">Discrete time and continuous time</a></li> <li><a href="/wiki/Proper_time" title="Proper time">Proper time</a></li> <li><a href="/wiki/Theory_of_relativity" title="Theory of relativity">Theory of relativity</a></li> <li><a href="/wiki/Time_dilation" title="Time dilation">Time dilation</a></li> <li><a href="/wiki/Gravitational_time_dilation" title="Gravitational time dilation">Gravitational time dilation</a></li> <li><a href="/wiki/Time_domain" title="Time domain">Time domain</a></li> <li><a href="/wiki/Time-translation_symmetry" title="Time-translation symmetry">Time-translation symmetry</a></li> <li><a href="/wiki/T-symmetry" title="T-symmetry">T-symmetry</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Horology" class="mw-redirect" title="Horology">Horology</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clock" title="Clock">Clock</a></li> <li><a href="/wiki/Astrarium" title="Astrarium">Astrarium</a></li> <li><a href="/wiki/Atomic_clock" title="Atomic clock">Atomic clock</a></li> <li><a href="/wiki/Complication_(horology)" title="Complication (horology)">Complication</a></li> <li><a href="/wiki/History_of_timekeeping_devices" title="History of timekeeping devices">History of timekeeping devices</a></li> <li><a href="/wiki/Hourglass" title="Hourglass">Hourglass</a></li> <li><a href="/wiki/Marine_chronometer" title="Marine chronometer">Marine chronometer</a></li> <li><a href="/wiki/Marine_sandglass" title="Marine sandglass">Marine sandglass</a></li> <li><a href="/wiki/Radio_clock" title="Radio clock">Radio clock</a></li> <li><a href="/wiki/Watch" title="Watch">Watch</a> <ul><li><a href="/wiki/Stopwatch" title="Stopwatch">stopwatch</a></li></ul></li> <li><a href="/wiki/Water_clock" title="Water clock">Water clock</a></li> <li><a href="/wiki/Sundial" title="Sundial">Sundial</a></li> <li><a href="/wiki/Dialing_scales" title="Dialing scales">Dialing scales</a></li> <li><a href="/wiki/Equation_of_time" title="Equation of time">Equation of time</a></li> <li><a href="/wiki/History_of_sundials" title="History of sundials">History of sundials</a></li> <li><a href="/wiki/Schema_for_horizontal_dials" title="Schema for horizontal dials">Sundial markup schema</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Calendar" title="Calendar">Calendar</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gregorian_calendar" title="Gregorian calendar">Gregorian</a></li> <li><a href="/wiki/Hebrew_calendar" title="Hebrew calendar">Hebrew</a></li> <li><a href="/wiki/Hindu_calendar" title="Hindu calendar">Hindu</a></li> <li><a href="/wiki/Holocene_calendar" title="Holocene calendar">Holocene</a></li> <li><a href="/wiki/Islamic_calendar" title="Islamic calendar">Islamic</a> (lunar Hijri)</li> <li><a href="/wiki/Julian_calendar" title="Julian calendar">Julian</a></li> <li><a href="/wiki/Solar_Hijri_calendar" title="Solar Hijri calendar">Solar Hijri</a></li> <li><a href="/wiki/Astronomical_year_numbering" title="Astronomical year numbering">Astronomical</a></li> <li><a href="/wiki/Dominical_letter" title="Dominical letter">Dominical letter</a></li> <li><a href="/wiki/Epact" title="Epact">Epact</a></li> <li><a href="/wiki/Equinox" title="Equinox">Equinox</a></li> <li><a href="/wiki/Intercalation_(timekeeping)" title="Intercalation (timekeeping)">Intercalation</a></li> <li><a href="/wiki/Julian_day" title="Julian day">Julian day</a></li> <li><a href="/wiki/Leap_year" title="Leap year">Leap year</a></li> <li><a href="/wiki/Lunar_calendar" title="Lunar calendar">Lunar</a></li> <li><a href="/wiki/Lunisolar_calendar" title="Lunisolar calendar">Lunisolar</a></li> <li><a href="/wiki/Solar_calendar" title="Solar calendar">Solar</a></li> <li><a href="/wiki/Solstice" title="Solstice">Solstice</a></li> <li><a href="/wiki/Tropical_year" title="Tropical year">Tropical year</a></li> <li><a href="/wiki/Determination_of_the_day_of_the_week" title="Determination of the day of the week">Weekday determination</a></li> <li><a href="/wiki/Names_of_the_days_of_the_week" title="Names of the days of the week">Weekday names</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Archaeology and geology</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chronological_dating" title="Chronological dating">Chronological dating</a></li> <li><a href="/wiki/Geologic_time_scale" title="Geologic time scale">Geologic time scale</a></li> <li><a href="/wiki/International_Commission_on_Stratigraphy" title="International Commission on Stratigraphy">International Commission on Stratigraphy</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Astronomical_chronology" title="Astronomical chronology">Astronomical chronology</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Galactic_year" title="Galactic year">Galactic year</a></li> <li><a href="/wiki/Nuclear_timescale" title="Nuclear timescale">Nuclear timescale</a></li> <li><a href="/wiki/Precession" title="Precession">Precession</a></li> <li><a href="/wiki/Sidereal_time" title="Sidereal time">Sidereal time</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other <a href="/wiki/Unit_of_time" title="Unit of time">units of time</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Instant" title="Instant">Instant</a></li> <li><a href="/wiki/Flick_(time)" title="Flick (time)">Flick</a></li> <li><a href="/wiki/Shake_(unit)" title="Shake (unit)">Shake</a></li> <li><a href="/wiki/Jiffy_(time)" title="Jiffy (time)">Jiffy</a></li> <li><a href="/wiki/Second" title="Second">Second</a></li> <li><a href="/wiki/Minute" title="Minute">Minute</a></li> <li><a href="/wiki/Moment_(unit)" title="Moment (unit)">Moment</a></li> <li><a href="/wiki/Hour" title="Hour">Hour</a></li> <li><a href="/wiki/Day" title="Day">Day</a></li> <li><a href="/wiki/Week" title="Week">Week</a></li> <li><a href="/wiki/Fortnight" title="Fortnight">Fortnight</a></li> <li><a href="/wiki/Month" title="Month">Month</a></li> <li><a href="/wiki/Year" title="Year">Year</a></li> <li><a href="/wiki/Olympiad" title="Olympiad">Olympiad</a></li> <li><a href="/wiki/Lustrum" title="Lustrum">Lustrum</a></li> <li><a href="/wiki/Decade" title="Decade">Decade</a></li> <li><a href="/wiki/Century" title="Century">Century</a></li> <li><a href="/wiki/Saeculum" title="Saeculum">Saeculum</a></li> <li><a href="/wiki/Millennium" title="Millennium">Millennium</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related topics</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chronology" title="Chronology">Chronology</a></li> <li><a href="/wiki/Duration_(philosophy)" title="Duration (philosophy)">Duration</a> <ul><li><a href="/wiki/Duration_(music)" title="Duration (music)">music</a></li></ul></li> <li><a href="/wiki/Mental_chronometry" title="Mental chronometry">Mental chronometry</a></li> <li><a href="/wiki/Decimal_time" title="Decimal time">Decimal time</a></li> <li><a href="/wiki/Metric_time" title="Metric time">Metric time</a></li> <li><a href="/wiki/System_time" title="System time">System time</a></li> <li><a href="/wiki/Time_metrology" class="mw-redirect" title="Time metrology">Time metrology</a></li> <li><a href="/wiki/Time_value_of_money" title="Time value of money">Time value of money</a></li> <li><a href="/wiki/Timekeeper" title="Timekeeper">Timekeeper</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><style data-mw-deduplicate="TemplateStyles:r886047488">.mw-parser-output .nobold{font-weight:normal}</style></div><div role="navigation" class="navbox" aria-labelledby="ISO_standards_by_standard_number" style="padding:3px"><table class="nowraplinks hlist mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:ISO_standards" title="Template:ISO standards"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:ISO_standards" title="Template talk:ISO standards"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:ISO_standards" title="Special:EditPage/Template:ISO standards"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="ISO_standards_by_standard_number" style="font-size:114%;margin:0 4em"><a href="/wiki/International_Organization_for_Standardization" title="International Organization for Standardization">ISO</a> standards <span class="nobold">by standard number</span></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div>List of <a href="/wiki/List_of_ISO_standards" title="List of ISO standards">ISO standards</a> – <a href="/wiki/List_of_ISO_romanizations" title="List of ISO romanizations">ISO romanizations</a> – <a href="/wiki/List_of_IEC_standards" title="List of IEC standards">IEC standards</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">1–9999</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ISO_1" title="ISO 1">1</a></li> <li><a href="/wiki/ISO_2" title="ISO 2">2</a></li> <li><a href="/wiki/Renard_series" title="Renard series">3</a></li> <li><a href="/wiki/ISO_4" title="ISO 4">4</a></li> <li><a href="/wiki/Film_speed" title="Film speed">6</a></li> <li><a href="/wiki/British_Standard_Pipe" title="British Standard Pipe">7</a></li> <li><a href="/wiki/ISO_9" title="ISO 9">9</a></li> <li><a href="/wiki/A440_(pitch_standard)" title="A440 (pitch standard)">16</a></li> <li><a href="/wiki/Renard_series" title="Renard series">17</a></li> <li><a href="/wiki/ISO_31" title="ISO 31">31</a> <ul><li><a href="/wiki/ISO_31-0" title="ISO 31-0">-0</a></li> <li><a href="/wiki/ISO_31-1" title="ISO 31-1">-1</a></li> <li><a href="/wiki/ISO_31-3" title="ISO 31-3">-3</a></li> <li><a href="/wiki/ISO_31-4" title="ISO 31-4">-4</a></li> <li><a href="/wiki/ISO_31-5" title="ISO 31-5">-5</a></li> <li><a href="/wiki/ISO_31-6" title="ISO 31-6">-6</a></li> <li><a href="/wiki/ISO_31-7" title="ISO 31-7">-7</a></li> <li><a href="/wiki/ISO_31-8" title="ISO 31-8">-8</a></li> <li><a href="/wiki/ISO_31-9" class="mw-redirect" title="ISO 31-9">-9</a></li> <li><a href="/wiki/ISO_31-10" title="ISO 31-10">-10</a></li> <li><a href="/wiki/ISO_31-11" title="ISO 31-11">-11</a></li> <li><a href="/wiki/ISO_31-12" class="mw-redirect" title="ISO 31-12">-12</a></li> <li><a href="/wiki/ISO_31-13" class="mw-redirect" title="ISO 31-13">-13</a></li></ul></li> <li><a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">68-1</a></li> <li><a href="/wiki/ISO_128" title="ISO 128">128</a></li> <li><a href="/wiki/ISO_216" title="ISO 216">216</a></li> <li><a href="/wiki/ISO_217" title="ISO 217">217</a></li> <li><a href="/wiki/Equal-loudness_contour" title="Equal-loudness contour">226</a></li> <li><a href="/wiki/British_Standard_Pipe" title="British Standard Pipe">228</a></li> <li><a href="/wiki/ISO_233" title="ISO 233">233</a></li> <li><a href="/wiki/ISO_259" title="ISO 259">259</a></li> <li><a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">261</a></li> <li><a href="/wiki/ISO_metric_screw_thread" title="ISO metric screw thread">262</a></li> <li><a href="/wiki/Kappa_number" title="Kappa number">302</a></li> <li><a href="/wiki/Vicat_softening_point" title="Vicat softening point">306</a></li> <li><a href="/wiki/Hazard_symbol#Ionizing_radiation_symbol" title="Hazard symbol">361</a></li> <li><a href="/wiki/Power_take-off" title="Power take-off">500</a></li> <li><a href="/wiki/Hot_shoe" title="Hot shoe">518</a></li> <li><a href="/wiki/Prontor-Compur" title="Prontor-Compur">519</a></li> <li><a href="/wiki/ISO_639" title="ISO 639">639</a> <ul><li><a href="/wiki/ISO_639-1" title="ISO 639-1">-1</a></li> <li><a href="/wiki/ISO_639-2" title="ISO 639-2">-2</a></li> <li><a href="/wiki/ISO_639-3" title="ISO 639-3">-3</a></li> <li><a href="/wiki/ISO_639-5" title="ISO 639-5">-5</a></li> <li><a href="/wiki/ISO_639-6" title="ISO 639-6">-6</a></li></ul></li> <li><a href="/wiki/ISO/IEC_646" title="ISO/IEC 646">646</a></li> <li><a href="/wiki/ISO_657" title="ISO 657">657</a></li> <li><a href="/wiki/ISO_668" title="ISO 668">668</a></li> <li><a href="/wiki/ISO_690" title="ISO 690">690</a></li> <li><a href="/wiki/ISO_704" title="ISO 704">704</a></li> <li><a href="/wiki/ISO_732" title="ISO 732">732</a></li> <li><a href="/wiki/Antimagnetic_watch" title="Antimagnetic watch">764</a></li> <li><a href="/wiki/Hole_punch" title="Hole punch">838</a></li> <li><a href="/wiki/ISO_843" title="ISO 843">843</a></li> <li><a href="/wiki/ISO_860" title="ISO 860">860</a></li> <li><a href="/wiki/ISO_898" title="ISO 898">898</a></li> <li><a href="/wiki/ISO_965" title="ISO 965">965</a></li> <li><a href="/wiki/ISO_999" title="ISO 999">999</a></li> <li><a href="/wiki/ISO_1000" title="ISO 1000">1000</a></li> <li><a href="/wiki/Magnetic_ink_character_recognition" title="Magnetic ink character recognition">1004</a></li> <li><a href="/wiki/135_film" title="135 film">1007</a></li> <li><a href="/wiki/OCR-A" title="OCR-A">1073-1</a></li> <li><a href="/wiki/OCR-B" title="OCR-B">1073-2</a></li> <li><a href="/wiki/Longitudinal_redundancy_check" title="Longitudinal redundancy check">1155</a></li> <li><a href="/wiki/Shock-resistant_watch#ISO_1413_shock-resistant_standard" title="Shock-resistant watch">1413</a></li> <li><a href="/wiki/ALGOL_60" title="ALGOL 60">1538</a></li> <li><a href="/wiki/ISO_1629" title="ISO 1629">1629</a></li> <li><a href="/wiki/ISO_1745" title="ISO 1745">1745</a></li> <li><a href="/wiki/COBOL" title="COBOL">1989</a></li> <li><a href="/wiki/ISO_2014" title="ISO 2014">2014</a></li> <li><a href="/wiki/ISO_2015" title="ISO 2015">2015</a></li> <li><a href="/wiki/ISO/IEC_2022" title="ISO/IEC 2022">2022</a></li> <li><a href="/wiki/ISO_2033" title="ISO 2033">2033</a></li> <li><a href="/wiki/ISO_2047" title="ISO 2047">2047</a></li> <li><a href="/wiki/ISBN" title="ISBN">2108</a></li> <li><a href="/wiki/ISO_2145" title="ISO 2145">2145</a></li> <li><a href="/wiki/ISO_2146" title="ISO 2146">2146</a></li> <li><a href="/wiki/Film_speed" title="Film speed">2240</a></li> <li><a href="/wiki/Water_Resistant_mark" title="Water Resistant mark">2281</a></li> <li><a href="/wiki/International_Standard_Atmosphere" title="International Standard Atmosphere">2533</a></li> <li><a href="/wiki/ISO_2709" title="ISO 2709">2709</a></li> <li><a href="/wiki/ISO_2711" title="ISO 2711">2711</a></li> <li><a href="/wiki/Film_speed" title="Film speed">2720</a></li> <li><a href="/wiki/ISO_2788" title="ISO 2788">2788</a></li> <li><a href="/wiki/ISO_2848" title="ISO 2848">2848</a></li> <li><a href="/wiki/ISO_2852" title="ISO 2852">2852</a></li> <li><a href="/wiki/ISO_2921" title="ISO 2921">2921</a></li> <li><a href="/wiki/126_film" title="126 film">3029</a></li> <li><a href="/wiki/ISO_3103" title="ISO 3103">3103</a></li> <li><a href="/wiki/ISO_3166" title="ISO 3166">3166</a> <ul><li><a href="/wiki/ISO_3166-1" title="ISO 3166-1">-1</a></li> <li><a href="/wiki/ISO_3166-2" title="ISO 3166-2">-2</a></li> <li><a href="/wiki/ISO_3166-3" title="ISO 3166-3">-3</a></li></ul></li> <li><a href="/wiki/International_Standard_Serial_Number" class="mw-redirect" title="International Standard Serial Number">3297</a></li> <li><a href="/wiki/ISO_3307" title="ISO 3307">3307</a></li> <li><a href="/wiki/O-ring" title="O-ring">3601</a></li> <li><a href="/wiki/Kunrei-shiki_romanization" title="Kunrei-shiki romanization">3602</a></li> <li><a href="/wiki/ISO_3864" title="ISO 3864">3864</a></li> <li><a href="/wiki/International_Standard_Recording_Code" title="International Standard Recording Code">3901</a></li> <li><a href="/wiki/FDI_World_Dental_Federation_notation" title="FDI World Dental Federation notation">3950</a></li> <li><a href="/wiki/ISO_3977" title="ISO 3977">3977</a></li> <li><a href="/wiki/ISO_4031" title="ISO 4031">4031</a></li> <li><a href="/wiki/ISO_4157" class="mw-redirect" title="ISO 4157">4157</a></li> <li><a href="/wiki/ISO_4165" title="ISO 4165">4165</a></li> <li><a href="/wiki/ISO_4217" title="ISO 4217">4217</a></li> <li><a href="/wiki/ISO/IEC_4909" title="ISO/IEC 4909">4909</a></li> <li><a href="/wiki/ISO/IEC_5218" title="ISO/IEC 5218">5218</a></li> <li><a href="/wiki/ISO_5426" title="ISO 5426">5426</a></li> <li><a href="/wiki/ISO_5427" title="ISO 5427">5427</a></li> <li><a href="/wiki/ISO_5428" title="ISO 5428">5428</a></li> <li><a href="/wiki/Accuracy_and_precision" title="Accuracy and precision">5725</a></li> <li><a href="/wiki/ISO_5775" title="ISO 5775">5775</a></li> <li><a href="/wiki/ISO_5776" title="ISO 5776">5776</a></li> <li><a href="/wiki/Film_speed" title="Film speed">5800</a></li> <li><a href="/wiki/Flowchart" title="Flowchart">5807</a></li> <li><a href="/wiki/ISO_5964" title="ISO 5964">5964</a></li> <li><a href="/wiki/International_Securities_Identification_Number" title="International Securities Identification Number">6166</a></li> <li><a href="/wiki/ISO_6344" title="ISO 6344">6344</a></li> <li><a href="/wiki/ISO_6346" title="ISO 6346">6346</a></li> <li><a href="/wiki/Minimal_BASIC" title="Minimal BASIC">6373</a></li> <li><a href="/wiki/ISO_6385" title="ISO 6385">6385</a></li> <li><a href="/wiki/Water_Resistant_mark" title="Water Resistant mark">6425</a></li> <li><a href="/wiki/ANSI_escape_code" title="ANSI escape code">6429</a></li> <li><a href="/wiki/ISO_6438" title="ISO 6438">6438</a></li> <li><a href="/wiki/ISO/IEC_6523" title="ISO/IEC 6523">6523</a></li> <li><a href="/wiki/ISO_6709" title="ISO 6709">6709</a></li> <li><a href="/wiki/ISO_6943" title="ISO 6943">6943</a></li> <li><a href="/wiki/ISO_7001" title="ISO 7001">7001</a></li> <li><a href="/wiki/ISO_7002" title="ISO 7002">7002</a></li> <li><a href="/wiki/ISO_7010" title="ISO 7010">7010</a></li> <li><a href="/wiki/ISO_7027" title="ISO 7027">7027</a></li> <li><a href="/wiki/ISO/IEC_7064" title="ISO/IEC 7064">7064</a></li> <li><a href="/wiki/Pinyin" title="Pinyin">7098</a></li> <li><a href="/wiki/Pascal_(programming_language)" title="Pascal (programming language)">7185</a></li> <li><a href="/wiki/ISO_7200" title="ISO 7200">7200</a></li> <li><a href="/wiki/OSI_model" title="OSI model">7498</a> <ul><li><a href="/wiki/OSI_model" title="OSI model">-1</a></li></ul></li> <li><a href="/wiki/ISO_7637" title="ISO 7637">7637</a></li> <li><a href="/wiki/ISO_7736" title="ISO 7736">7736</a></li> <li><a href="/wiki/ISO/IEC_7810" title="ISO/IEC 7810">7810</a></li> <li><a href="/wiki/ISO/IEC_7811" title="ISO/IEC 7811">7811</a></li> <li><a href="/wiki/ISO/IEC_7812" title="ISO/IEC 7812">7812</a></li> <li><a href="/wiki/ISO/IEC_7813" title="ISO/IEC 7813">7813</a></li> <li><a href="/wiki/ISO/IEC_7816" title="ISO/IEC 7816">7816</a></li> <li><a href="/wiki/Graphical_Kernel_System" title="Graphical Kernel System">7942</a></li> <li><a href="/wiki/ISO_8000" title="ISO 8000">8000</a></li> <li><a href="/wiki/On-board_diagnostics" title="On-board diagnostics">8093</a></li> <li><a href="/wiki/ISO_8178" title="ISO 8178">8178</a></li> <li><a href="/wiki/Fuel_oil" title="Fuel oil">8217</a></li> <li><a href="/wiki/ISO_8373" class="mw-redirect" title="ISO 8373">8373</a></li> <li><a href="/wiki/ISO_8501-1" title="ISO 8501-1">8501-1</a></li> <li><a href="/wiki/FTAM" title="FTAM">8571</a></li> <li><a href="/wiki/ISO_8583" title="ISO 8583">8583</a></li> <li><a class="mw-selflink selflink">8601</a></li> <li><a href="/wiki/Open_Document_Architecture" title="Open Document Architecture">8613</a></li> <li><a href="/wiki/Computer_Graphics_Metafile" title="Computer Graphics Metafile">8632</a></li> <li><a href="/wiki/Graphical_Kernel_System" title="Graphical Kernel System">8651</a></li> <li><a href="/wiki/ISO/IEC_8652" title="ISO/IEC 8652">8652</a></li> <li><a href="/wiki/ISO_8691" title="ISO 8691">8691</a></li> <li><a href="/wiki/Graphical_Kernel_System" title="Graphical Kernel System">8805/8806</a></li> <li><a href="/wiki/Language_Of_Temporal_Ordering_Specification" class="mw-redirect" title="Language Of Temporal Ordering Specification">8807</a></li> <li><a href="/wiki/Fuse_(automotive)" class="mw-redirect" title="Fuse (automotive)">8820-5</a></li> <li><a href="/wiki/ISO/IEC_8859" title="ISO/IEC 8859">8859</a> <ul><li><a href="/wiki/ISO/IEC_8859-1" title="ISO/IEC 8859-1">-1</a></li> <li><a href="/wiki/ISO/IEC_8859-2" title="ISO/IEC 8859-2">-2</a></li> <li><a href="/wiki/ISO/IEC_8859-3" title="ISO/IEC 8859-3">-3</a></li> <li><a href="/wiki/ISO/IEC_8859-4" title="ISO/IEC 8859-4">-4</a></li> <li><a href="/wiki/ISO/IEC_8859-5" title="ISO/IEC 8859-5">-5</a></li> <li><a href="/wiki/ISO/IEC_8859-6" title="ISO/IEC 8859-6">-6</a></li> <li><a href="/wiki/ISO/IEC_8859-7" title="ISO/IEC 8859-7">-7</a></li> <li><a href="/wiki/ISO/IEC_8859-8" title="ISO/IEC 8859-8">-8</a></li> <li><a href="/wiki/ISO-8859-8-I" title="ISO-8859-8-I">-8-I</a></li> <li><a href="/wiki/ISO/IEC_8859-9" title="ISO/IEC 8859-9">-9</a></li> <li><a href="/wiki/ISO/IEC_8859-10" title="ISO/IEC 8859-10">-10</a></li> <li><a href="/wiki/ISO/IEC_8859-11" title="ISO/IEC 8859-11">-11</a></li> <li><a href="/wiki/ISO/IEC_8859-12" class="mw-redirect" title="ISO/IEC 8859-12">-12</a></li> <li><a href="/wiki/ISO/IEC_8859-13" title="ISO/IEC 8859-13">-13</a></li> <li><a href="/wiki/ISO/IEC_8859-14" title="ISO/IEC 8859-14">-14</a></li> <li><a href="/wiki/ISO/IEC_8859-15" title="ISO/IEC 8859-15">-15</a></li> <li><a href="/wiki/ISO/IEC_8859-16" title="ISO/IEC 8859-16">-16</a></li></ul></li> <li><a href="/wiki/Standard_Generalized_Markup_Language" title="Standard Generalized Markup Language">8879</a></li> <li><a href="/wiki/ISO_9000" class="mw-redirect" title="ISO 9000">9000/9001</a></li> <li><a href="/wiki/ASMO_449" title="ASMO 449">9036</a></li> <li><a href="/wiki/SQL" title="SQL">9075</a></li> <li><a href="/wiki/ISO/IEC_9126" title="ISO/IEC 9126">9126</a></li> <li><a href="/wiki/On-board_diagnostics" title="On-board diagnostics">9141</a></li> <li><a href="/wiki/Salt_spray_test" title="Salt spray test">9227</a></li> <li><a href="/wiki/ISO_9241" title="ISO 9241">9241</a></li> <li><a href="/wiki/File_Allocation_Table" title="File Allocation Table">9293</a></li> <li><a href="/wiki/Fiber_Distributed_Data_Interface" title="Fiber Distributed Data Interface">9314</a></li> <li><a href="/wiki/ISO_9362" title="ISO 9362">9362</a></li> <li><a href="/wiki/Shoe_size" title="Shoe size">9407</a></li> <li><a href="/wiki/CHILL" title="CHILL">9496</a></li> <li><a href="/wiki/Manufacturing_Message_Specification" title="Manufacturing Message Specification">9506</a></li> <li><a href="/wiki/ISO/IEC_9529" title="ISO/IEC 9529">9529</a></li> <li><a href="/wiki/ISO_9564" title="ISO 9564">9564</a></li> <li><a href="/wiki/PHIGS" title="PHIGS">9592/9593</a></li> <li><a href="/wiki/X.500" title="X.500">9594</a></li> <li><a href="/wiki/ISO_9660" title="ISO 9660">9660</a></li> <li><a href="/wiki/ISO/IEC_9797-1" title="ISO/IEC 9797-1">9797-1</a></li> <li><a href="/wiki/ISO_9897" title="ISO 9897">9897</a></li> <li><a href="/wiki/ANSI_C" title="ANSI C">9899</a></li> <li><a href="/wiki/POSIX" title="POSIX">9945</a></li> <li><a href="/wiki/Romanization_of_Georgian" title="Romanization of Georgian">9984</a></li> <li><a href="/wiki/Romanization_of_Armenian" title="Romanization of Armenian">9985</a></li> <li><a href="/wiki/ISO/IEC_9995" title="ISO/IEC 9995">9995</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">10000–19999</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ISO_10006" title="ISO 10006">10006</a></li> <li><a href="/wiki/ISO_10007" title="ISO 10007">10007</a></li> <li><a href="/wiki/ISO/IEC_10116" title="ISO/IEC 10116">10116</a></li> <li><a href="/wiki/Whirlpool_(hash_function)" title="Whirlpool (hash function)">10118-3</a></li> <li><a href="/wiki/ISO_10160" title="ISO 10160">10160</a></li> <li><a href="/wiki/ISO_10161" title="ISO 10161">10161</a></li> <li><a href="/wiki/Guidelines_for_the_Definition_of_Managed_Objects" title="Guidelines for the Definition of Managed Objects">10165</a></li> <li><a href="/wiki/Document_Style_Semantics_and_Specification_Language" title="Document Style Semantics and Specification Language">10179</a></li> <li><a href="/wiki/Pascal_(programming_language)#ISO/IEC_10206:1990_Extended_Pascal" title="Pascal (programming language)">10206</a></li> <li><a href="/wiki/ISO_10218" title="ISO 10218">10218</a></li> <li><a href="/wiki/Full_BASIC" title="Full BASIC">10279</a></li> <li><a href="/wiki/ISO_10303" title="ISO 10303">10303</a> <ul><li><a href="/wiki/EXPRESS_(data_modeling_language)" title="EXPRESS (data modeling language)">-11</a></li> <li><a href="/wiki/ISO_10303-21" title="ISO 10303-21">-21</a></li> <li><a href="/wiki/ISO_10303-22" title="ISO 10303-22">-22</a></li> <li><a href="/wiki/ISO_10303-28" title="ISO 10303-28">-28</a></li> <li><a href="/wiki/STEP-NC" title="STEP-NC">-238</a></li></ul></li> <li><a href="/wiki/Market_Identifier_Code" title="Market Identifier Code">10383</a></li> <li><a href="/wiki/ArmSCII" title="ArmSCII">10585</a></li> <li><a href="/wiki/IS-IS" title="IS-IS">10589</a></li> <li><a href="/wiki/ISO_10628" title="ISO 10628">10628</a></li> <li><a href="/wiki/Universal_Coded_Character_Set" title="Universal Coded Character Set">10646</a></li> <li><a href="/wiki/Torx" title="Torx">10664</a></li> <li><a href="/wiki/RM-ODP" title="RM-ODP">10746</a></li> <li><a href="/wiki/Multibus" title="Multibus">10861</a></li> <li><a href="/wiki/International_Standard_Music_Number" title="International Standard Music Number">10957</a></li> <li><a href="/wiki/ISO_10962" title="ISO 10962">10962</a></li> <li><a href="/wiki/ISO/IEC_10967" title="ISO/IEC 10967">10967</a></li> <li><a href="/wiki/ISO/IEEE_11073" title="ISO/IEEE 11073">11073</a></li> <li><a href="/wiki/ISO_11170" title="ISO 11170">11170</a></li> <li><a href="/wiki/MPEG-1" title="MPEG-1">11172</a></li> <li><a href="/wiki/ISO/IEC_11179" title="ISO/IEC 11179">11179</a></li> <li><a href="/wiki/ISO/IEC_11404" title="ISO/IEC 11404">11404</a></li> <li><a href="/wiki/JBIG" title="JBIG">11544</a></li> <li><a href="/wiki/ISO_11783" title="ISO 11783">11783</a></li> <li><a href="/wiki/ISO_11784_and_ISO_11785" title="ISO 11784 and ISO 11785">11784</a></li> <li><a href="/wiki/ISO_11784_and_ISO_11785" title="ISO 11784 and ISO 11785">11785</a></li> <li><a href="/wiki/ISO/IEC_11801" title="ISO/IEC 11801">11801</a></li> <li><a href="/wiki/Trusted_Platform_Module" title="Trusted Platform Module">11889</a></li> <li><a href="/wiki/CAN_bus#CAN_lower-layer_standards" title="CAN bus">11898</a></li> <li><a href="/wiki/ISO_11940" title="ISO 11940">11940</a> (<a href="/wiki/ISO_11940-2" title="ISO 11940-2">-2</a>)</li> <li><a href="/wiki/ISO/TR_11941" title="ISO/TR 11941">11941</a></li> <li><a href="/wiki/ISO/TR_11941" title="ISO/TR 11941">11941 (TR)</a></li> <li><a href="/wiki/ISO_11992" title="ISO 11992">11992</a></li> <li><a href="/wiki/ISO_12006" title="ISO 12006">12006</a></li> <li><a href="/wiki/DICOM" title="DICOM">12052</a></li> <li><a href="/wiki/ISO/IEC_TR_12182" title="ISO/IEC TR 12182">12182</a></li> <li><a href="/wiki/ISO/IEC_12207" title="ISO/IEC 12207">12207</a></li> <li><a href="/wiki/TIFF/EP" title="TIFF/EP">12234-2</a></li> <li><a href="/wiki/Linguistic_categories#ISO_12620_(ISO_TC37_Data_Category_Registry,_ISOcat)" title="Linguistic categories">12620</a></li> <li><a href="/wiki/Prolog" title="Prolog">13211</a> <ul><li><a href="/wiki/Prolog" title="Prolog">-1</a></li> <li><a href="/wiki/Prolog" title="Prolog">-2</a></li></ul></li> <li><a href="/wiki/Isofix" title="Isofix">13216</a></li> <li><a href="/wiki/Topic_map" title="Topic map">13250</a></li> <li><a href="/wiki/ISO_13399" title="ISO 13399">13399</a></li> <li><a href="/wiki/ISO_13406-2" title="ISO 13406-2">13406-2</a></li> <li><a href="/wiki/110_film" title="110 film">13450</a></li> <li><a href="/wiki/ISO_13485" title="ISO 13485">13485</a></li> <li><a href="/wiki/ISO_13490" title="ISO 13490">13490</a></li> <li><a href="/wiki/ISO_13567" title="ISO 13567">13567</a></li> <li><a href="/wiki/Z_notation" title="Z notation">13568</a></li> <li><a href="/wiki/ISO_13584" title="ISO 13584">13584</a></li> <li><a href="/wiki/International_Bank_Account_Number" title="International Bank Account Number">13616</a></li> <li><a href="/wiki/ISLISP" title="ISLISP">13816</a></li> <li><a href="/wiki/MPEG-2" title="MPEG-2">13818</a></li> <li><a href="/wiki/ISO_14000" class="mw-redirect" title="ISO 14000">14000</a></li> <li><a href="/wiki/ISO_14031" title="ISO 14031">14031</a></li> <li><a href="/wiki/ISO_14224" title="ISO 14224">14224</a></li> <li><a href="/wiki/PDF/UA" title="PDF/UA">14289</a></li> <li><a href="/wiki/Horsepower" title="Horsepower">14396</a></li> <li><a href="/wiki/ISO/IEC_14443" title="ISO/IEC 14443">14443</a></li> <li><a href="/wiki/MPEG-4" title="MPEG-4">14496</a> <ul><li><a href="/wiki/MPEG-4_Part_2" title="MPEG-4 Part 2">-2</a></li> <li><a href="/wiki/MPEG-4_Part_3" title="MPEG-4 Part 3">-3</a></li> <li><a href="/wiki/Delivery_Multimedia_Integration_Framework" title="Delivery Multimedia Integration Framework">-6</a></li> <li><a href="/wiki/Advanced_Video_Coding" title="Advanced Video Coding">-10</a></li> <li><a href="/wiki/MPEG-4_Part_11" title="MPEG-4 Part 11">-11</a></li> <li><a href="/wiki/ISO_base_media_file_format" title="ISO base media file format">-12</a></li> <li><a href="/wiki/MP4_file_format" title="MP4 file format">-14</a></li> <li><a href="/wiki/MP4_file_format" title="MP4 file format">-17</a></li> <li><a href="/wiki/MP4_file_format" title="MP4 file format">-20</a></li></ul></li> <li><a href="/wiki/ISO_14617" title="ISO 14617">14617</a></li> <li><a href="/wiki/ISO_14644" title="ISO 14644">14644</a></li> <li><a href="/wiki/STEP-NC" title="STEP-NC">14649</a></li> <li><a href="/wiki/ISO/IEC_14651" title="ISO/IEC 14651">14651</a></li> <li><a href="/wiki/ISO_14698" title="ISO 14698">14698</a></li> <li><a href="/wiki/Software_maintenance" title="Software maintenance">14764</a></li> <li><a href="/wiki/C%2B%2B" title="C++">14882</a></li> <li><a href="/wiki/ISO_14971" title="ISO 14971">14971</a></li> <li><a href="/wiki/ISO_15022" title="ISO 15022">15022</a></li> <li><a href="/wiki/ISO_15189" title="ISO 15189">15189</a></li> <li><a href="/wiki/ISO/IEC_15288" title="ISO/IEC 15288">15288</a></li> <li><a href="/wiki/Ada_Semantic_Interface_Specification" title="Ada Semantic Interface Specification">15291</a></li> <li><a href="/wiki/ISO_15398" title="ISO 15398">15398</a></li> <li><a href="/wiki/Common_Criteria" title="Common Criteria">15408</a></li> <li><a href="/wiki/JPEG_2000" title="JPEG 2000">15444</a> <ul><li><a href="/wiki/Motion_JPEG_2000" title="Motion JPEG 2000">-3</a></li> <li><a href="/wiki/JPIP" title="JPIP">-9</a></li></ul></li> <li><a href="/wiki/HTML" title="HTML">15445</a></li> <li><a href="/wiki/PDF417" title="PDF417">15438</a></li> <li><a href="/wiki/ISO/IEC_15504" title="ISO/IEC 15504">15504</a></li> <li><a href="/wiki/International_Standard_Identifier_for_Libraries_and_Related_Organizations" title="International Standard Identifier for Libraries and Related Organizations">15511</a></li> <li><a href="/wiki/ISO_15686" title="ISO 15686">15686</a></li> <li><a href="/wiki/ISO/IEC_15693" title="ISO/IEC 15693">15693</a></li> <li><a href="/wiki/International_Standard_Audiovisual_Number" title="International Standard Audiovisual Number">15706</a> <ul><li><a href="/wiki/International_Standard_Audiovisual_Number" title="International Standard Audiovisual Number">-2</a></li></ul></li> <li><a href="/wiki/International_Standard_Musical_Work_Code" title="International Standard Musical Work Code">15707</a></li> <li><a href="/wiki/ISO/IEC_15897" title="ISO/IEC 15897">15897</a></li> <li><a href="/wiki/ISO_15919" title="ISO 15919">15919</a></li> <li><a href="/wiki/ISO_15924" title="ISO 15924">15924</a></li> <li><a href="/wiki/ISO_15926" title="ISO 15926">15926</a></li> <li><a href="/wiki/ISO_15926_WIP" title="ISO 15926 WIP">15926 WIP</a></li> <li><a href="/wiki/PDF/X" title="PDF/X">15930</a></li> <li><a href="/wiki/MPEG-7" title="MPEG-7">15938</a></li> <li><a href="/wiki/MaxiCode" title="MaxiCode">16023</a></li> <li><a href="/wiki/ECMAScript" title="ECMAScript">16262</a></li> <li><a href="/wiki/Quality_function_deployment" title="Quality function deployment">16355-1</a></li> <li><a href="/wiki/Mixed_raster_content" title="Mixed raster content">16485</a></li> <li><a href="/wiki/PDF/VT" title="PDF/VT">16612-2</a></li> <li><a href="/wiki/ISO_16750" title="ISO 16750">16750</a></li> <li><a href="/wiki/IATF_16949" title="IATF 16949">16949 (TS)</a></li> <li><a href="/wiki/ISO/IEC_17024" title="ISO/IEC 17024">17024</a></li> <li><a href="/wiki/ISO/IEC_17025" title="ISO/IEC 17025">17025</a></li> <li><a href="/wiki/ISO_17100" title="ISO 17100">17100</a></li> <li><a href="/wiki/Open_Virtualization_Format" title="Open Virtualization Format">17203</a></li> <li><a href="/wiki/SDMX" title="SDMX">17369</a></li> <li><a href="/wiki/Legal_Entity_Identifier" title="Legal Entity Identifier">17442</a></li> <li><a href="/wiki/COLLADA" title="COLLADA">17506</a></li> <li><a href="/wiki/ISO/IEC_27002" title="ISO/IEC 27002">17799</a></li> <li><a href="/wiki/QR_code" title="QR code">18004</a></li> <li><a href="/wiki/ISO/IEC_18014" title="ISO/IEC 18014">18014</a></li> <li><a href="/wiki/JPEG_XL" title="JPEG XL">18181</a></li> <li><a href="/wiki/ISO_18245" title="ISO 18245">18245</a></li> <li><a href="/wiki/Process_Specification_Language" title="Process Specification Language">18629</a></li> <li><a href="/wiki/Photographic_Activity_Test" title="Photographic Activity Test">18916</a></li> <li><a href="/wiki/PDF/A" title="PDF/A">19005</a></li> <li><a href="/wiki/ISO_19011" title="ISO 19011">19011</a></li> <li><a href="/wiki/ISO_19092-1" class="mw-redirect" title="ISO 19092-1">19092</a> <ul><li><a href="/wiki/ISO_19092-1" class="mw-redirect" title="ISO 19092-1">-1</a></li> <li><a href="/wiki/ISO_19092-2" class="mw-redirect" title="ISO 19092-2">-2</a></li></ul></li> <li><a href="/wiki/ISO_19114" title="ISO 19114">19114</a></li> <li><a href="/wiki/Geospatial_metadata#ISO_19115:_Geographic_information_–_Metadata" title="Geospatial metadata">19115</a></li> <li><a href="/wiki/Simple_Features" title="Simple Features">19125</a></li> <li><a href="/wiki/Geography_Markup_Language#ISO_19136" title="Geography Markup Language">19136</a></li> <li><a href="/wiki/Shoe_size" title="Shoe size">19407</a></li> <li><a href="/wiki/ISO_19439" title="ISO 19439">19439</a></li> <li><a href="/wiki/Common_Object_Request_Broker_Architecture" title="Common Object Request Broker Architecture">19500</a></li> <li><a href="/wiki/Unified_Modeling_Language" title="Unified Modeling Language">19501</a></li> <li><a href="/wiki/Meta-Object_Facility" title="Meta-Object Facility">19502</a></li> <li><a href="/wiki/XML_Metadata_Interchange" title="XML Metadata Interchange">19503</a></li> <li><a href="/wiki/Unified_Modeling_Language" title="Unified Modeling Language">19505</a></li> <li><a href="/wiki/Knowledge_Discovery_Metamodel" title="Knowledge Discovery Metamodel">19506</a></li> <li><a href="/wiki/Object_Constraint_Language" title="Object Constraint Language">19507</a></li> <li><a href="/wiki/Meta-Object_Facility" title="Meta-Object Facility">19508</a></li> <li><a href="/wiki/XML_Metadata_Interchange" title="XML Metadata Interchange">19509</a></li> <li><a href="/wiki/Business_Process_Model_and_Notation" title="Business Process Model and Notation">19510</a></li> <li><a href="/wiki/ISO_19600" title="ISO 19600">19600</a></li> <li><a href="/wiki/ISO/IEC_19752" title="ISO/IEC 19752">19752</a></li> <li><a href="/wiki/RELAX_NG" title="RELAX NG">19757</a></li> <li><a href="/wiki/ISO/IEC_19770" title="ISO/IEC 19770">19770</a></li> <li><a href="/wiki/X3D" title="X3D">19775-1</a></li> <li><a href="/wiki/ISO/IEC_19794-5" title="ISO/IEC 19794-5">19794-5</a></li> <li><a href="/wiki/Cloud_Infrastructure_Management_Interface" title="Cloud Infrastructure Management Interface">19831</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">20000–29999</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ISO/IEC_20000" title="ISO/IEC 20000">20000</a></li> <li><a href="/wiki/ISO_20022" title="ISO 20022">20022</a></li> <li><a href="/wiki/ISO_20121" title="ISO 20121">20121</a></li> <li><a href="/wiki/ISO_20400" title="ISO 20400">20400</a></li> <li><a href="/wiki/Open_Data_Protocol" title="Open Data Protocol">20802</a></li> <li><a href="/wiki/Han_Xin_code" title="Han Xin code">20830</a></li> <li><a href="/wiki/MPEG-21" title="MPEG-21">21000</a></li> <li><a href="/wiki/ISO_21001" title="ISO 21001">21001</a></li> <li><a href="/wiki/International_Standard_Text_Code" title="International Standard Text Code">21047</a></li> <li><a href="/wiki/JPEG_XS" title="JPEG XS">21122</a></li> <li><a href="/wiki/ISO_21500" title="ISO 21500">21500</a></li> <li><a href="/wiki/ISO/IEC_21827" title="ISO/IEC 21827">21827</a></li> <li><a href="/wiki/ISO_22000" title="ISO 22000">22000</a></li> <li><a href="/wiki/ECMAScript" title="ECMAScript">22275</a></li> <li><a href="/wiki/ISO_22300" title="ISO 22300">22300</a></li> <li><a href="/wiki/ISO_22301" title="ISO 22301">22301</a></li> <li><a href="/wiki/ISO_22395" title="ISO 22395">22395</a></li> <li><a href="/wiki/ECMAScript_for_XML" title="ECMAScript for XML">22537</a></li> <li><a href="/wiki/MPEG-A" title="MPEG-A">23000</a></li> <li><a href="/wiki/MPEG-D" title="MPEG-D">23003</a></li> <li><a href="/wiki/MPEG-H" title="MPEG-H">23008</a></li> <li><a href="/wiki/Dynamic_Adaptive_Streaming_over_HTTP" title="Dynamic Adaptive Streaming over HTTP">23009</a></li> <li><a href="/wiki/Versatile_Video_Coding" title="Versatile Video Coding">23090-3</a></li> <li><a href="/wiki/MPEG-G" title="MPEG-G">23092</a></li> <li><a href="/wiki/Essential_Video_Coding" title="Essential Video Coding">23094-1</a></li> <li><a href="/wiki/LCEVC" title="LCEVC">23094-2</a></li> <li><a href="/wiki/C_Sharp_(programming_language)" title="C Sharp (programming language)">23270</a></li> <li><a href="/wiki/Common_Language_Infrastructure" title="Common Language Infrastructure">23271</a></li> <li><a href="/wiki/Linux_Standard_Base" title="Linux Standard Base">23360</a></li> <li><a href="/wiki/Rectangular_Micro_QR_Code" title="Rectangular Micro QR Code">23941</a></li> <li><a href="/wiki/PDF/E" title="PDF/E">24517</a></li> <li><a href="/wiki/Lexical_Markup_Framework" title="Lexical Markup Framework">24613</a></li> <li><a href="/wiki/ISO-TimeML" title="ISO-TimeML">24617</a></li> <li><a href="/wiki/Common_Logic" title="Common Logic">24707</a></li> <li><a href="/wiki/MicroPDF417" title="MicroPDF417">24728</a></li> <li><a href="/wiki/ISO_25178" title="ISO 25178">25178</a></li> <li><a href="/wiki/ISO_25964" title="ISO 25964">25964</a></li> <li><a href="/wiki/ISO_26000" title="ISO 26000">26000</a></li> <li><a href="/wiki/ISO_26262" title="ISO 26262">26262</a></li> <li><a href="/wiki/OpenDocument" title="OpenDocument">26300</a></li> <li><a href="/wiki/Digital_object_identifier" title="Digital object identifier">26324</a></li> <li><a href="/wiki/ISO/IEC_27000-series" class="mw-redirect" title="ISO/IEC 27000-series">27000 series</a></li> <li><a href="/wiki/ISO/IEC_27000" title="ISO/IEC 27000">27000</a></li> <li><a href="/wiki/ISO/IEC_27001" title="ISO/IEC 27001">27001</a></li> <li><a href="/wiki/ISO/IEC_27002" title="ISO/IEC 27002">27002</a></li> <li><a href="/wiki/ISO/IEC_27005" title="ISO/IEC 27005">27005</a></li> <li><a href="/wiki/ISO/IEC_27006" title="ISO/IEC 27006">27006</a></li> <li><a href="/wiki/International_Standard_Name_Identifier" title="International Standard Name Identifier">27729</a></li> <li><a href="/wiki/ISO_28000" title="ISO 28000">28000</a></li> <li>29110</li> <li><a href="/wiki/Requirements_engineering" title="Requirements engineering">29148</a></li> <li><a href="/wiki/JPEG_XR" title="JPEG XR">29199-2</a></li> <li><a href="/wiki/Office_Open_XML" title="Office Open XML">29500</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">30000+</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ruby_(programming_language)" title="Ruby (programming language)">30170</a></li> <li><a href="/wiki/ISO_31000" title="ISO 31000">31000</a></li> <li><a href="/wiki/PDF" title="PDF">32000</a></li> <li><a href="/wiki/ISO_37001" title="ISO 37001">37001</a></li> <li><a href="/wiki/ISO/IEC_38500" title="ISO/IEC 38500">38500</a></li> <li><a href="/wiki/Graph_Query_Language" title="Graph Query Language">39075</a></li> <li><a href="/wiki/Web_Content_Accessibility_Guidelines" title="Web Content Accessibility Guidelines">40500</a></li> <li><a href="/wiki/ISO/IEC_42010" title="ISO/IEC 42010">42010</a></li> <li><a href="/wiki/ISO_45001" title="ISO 45001">45001</a></li> <li><a href="/wiki/ISO_50001" title="ISO 50001">50001</a></li> <li><a href="/wiki/ISO_55000" title="ISO 55000">55000</a></li> <li><a href="/wiki/ISO_56000" title="ISO 56000">56000</a></li> <li><a href="/wiki/ISO/IEC_80000" title="ISO/IEC 80000">80000</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:ISO_standards" title="Category:ISO standards">Category</a></li></ul> </div></td></tr></tbody></table></div>    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