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href="https://de.wikipedia.org/wiki/Jiffy" title="Jiffy – German" lang="de" hreflang="de" data-title="Jiffy" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%A7%80%ED%94%BC_(%EC%8B%9C%EA%B0%84)" title="지피 (시간) – Korean" lang="ko" hreflang="ko" data-title="지피 (시간)" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Jiffy_(tijd)" title="Jiffy (tijd) – Dutch" lang="nl" hreflang="nl" data-title="Jiffy (tijd)" 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/%E3%82%B8%E3%83%95%E3%82%A3" title="ジフィ – Japanese" lang="ja" hreflang="ja" data-title="ジフィ" 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-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Nh%C3%A1y_m%E1%BA%AFt_(th%E1%BB%9Di_gian)" title="Nháy mắt (thời gian) – Vietnamese" lang="vi" hreflang="vi" data-title="Nháy mắt (thời gian)" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/Jiffy" title="Jiffy – Chinese" lang="zh" hreflang="zh" data-title="Jiffy" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span 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The present address (URL) is a <a href="/wiki/Help:Permanent_link" title="Help:Permanent link">permanent link</a> to this version.</b></p><div id="revision-info-current-plain" style="display: none;">Revision as of 02:36, 13 January 2024 by <a href="/wiki/User:Quondum" class="mw-userlink" title="User:Quondum" data-mw-revid="1195263380"><bdi>Quondum</bdi></a> <span class="mw-usertoollinks">(<a href="/wiki/User_talk:Quondum" class="mw-usertoollinks-talk" title="User talk:Quondum">talk</a> | <a href="/wiki/Special:Contributions/Quondum" class="mw-usertoollinks-contribs" title="Special:Contributions/Quondum">contribs</a>)</span> <span class="comment">(cleanup)</span></div></div><div id="mw-revision-nav">(<a href="/w/index.php?title=Jiffy_(time)&diff=prev&oldid=1195263380" title="Jiffy (time)">diff</a>) <a href="/w/index.php?title=Jiffy_(time)&direction=prev&oldid=1195263380" title="Jiffy (time)">← Previous revision</a> | Latest revision (diff) | Newer revision → (diff)</div></div></div></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">Measurement of time</div> <p><b>Jiffy</b> can be an informal term for any unspecified short period, as in "I will be back in a jiffy". From this, it has acquired a number of more precise applications as the name of multiple <a href="/wiki/Unit_of_time" title="Unit of time">units of measurement</a>, each used to express or measure very brief durations of time. First attested in 1780,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> the word's origin is unclear, though one suggestion is that it was <a href="/wiki/Thieves%27_cant" title="Thieves' cant">thieves' cant</a> for lightning.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> It was common in a number of <a href="/wiki/Scots_English" class="mw-redirect" title="Scots English">Scots English</a> dialects and in <a href="/wiki/John_Jamieson" title="John Jamieson">John Jamieson</a>'s <i>Etymological Dictionary of the Scottish Language</i> (1808) it is suggested that it is a corruption of '<a href="https://en.wiktionary.org/wiki/gliff" class="extiw" title="wiktionary:gliff">gliff</a>' (glimpse) or 'gliffin' (glance) <sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> (compare: 'in the blink of an eye') and may ultimately derive from <a href="/wiki/Gothic_language" title="Gothic language">Gothic</a> or <a href="/wiki/Teutonic_language" class="mw-redirect" title="Teutonic language">Teutonic</a> words for 'shine'. ('Gliff' or 'gliss' for 'a transient view' was also found in older English poetry as early as 1738.<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>) </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Beginnings_in_measurement">Beginnings in measurement</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Jiffy_(time)&action=edit&section=1" title="Edit section: Beginnings in measurement"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The earliest technical usage for jiffy was defined by <a href="/wiki/Gilbert_Newton_Lewis" class="mw-redirect" title="Gilbert Newton Lewis">Gilbert Newton Lewis</a> (1875–1946). He proposed in 1926 a <a href="/wiki/Unit_of_time" title="Unit of time">unit of time</a> called the "jiffy" which was equal to the time it takes <a href="/wiki/Light" title="Light">light</a> to travel one centimeter in vacuum (approximately 33.3564 <a href="/wiki/Picosecond" title="Picosecond">picoseconds</a>).<sup id="cite_ref-numericana_5-0" class="reference"><a href="#cite_note-numericana-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> It has since been redefined for different measurements depending on the field of study.<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> </p> <div class="mw-heading mw-heading2"><h2 id="Uses">Uses</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Jiffy_(time)&action=edit&section=2" title="Edit section: Uses"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Electronics">Electronics</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Jiffy_(time)&action=edit&section=3" title="Edit section: Electronics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In <a href="/wiki/Electronics" title="Electronics">electronics</a>, a jiffy is the period of an <a href="/wiki/Alternating_current" title="Alternating current">alternating current</a> power cycle,<sup id="cite_ref-numericana_5-1" class="reference"><a href="#cite_note-numericana-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> 1/60 or 1/50 of a second in most <a href="/wiki/Mains_power" class="mw-redirect" title="Mains power">mains power</a> supplies. </p> <div class="mw-heading mw-heading3"><h3 id="Computing">Computing</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Jiffy_(time)&action=edit&section=4" title="Edit section: Computing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In <a href="/wiki/Computing" title="Computing">computing</a>, a jiffy was originally the time between two ticks of the <a href="/wiki/System_time" title="System time">system timer</a> <a href="/wiki/Interrupt" title="Interrupt">interrupt</a>.<sup id="cite_ref-NOHZ-txt_7-0" class="reference"><a href="#cite_note-NOHZ-txt-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> It is not an absolute time interval unit, since its duration depends on the clock interrupt frequency of the particular hardware platform.<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><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Accuracy_dispute#Disputed_statement" title="Wikipedia:Accuracy dispute"><span title="set by software on at least some platforms e.g. i386 Linux at compile time, runtime variable on Windows, plus we're now in an era of tickless kernels using higher resolution timers to provide the same feature in a dynamic way (October 2013)">dubious</span></a> – <a href="/wiki/Talk:Jiffy_(time)#Dubious" title="Talk:Jiffy (time)">discuss</a></i>]</sup> </p><p>Many older game consoles (which use <a href="/wiki/Television" title="Television">televisions</a> as a display device) commonly synchronize the system interrupt timer with the vertical frequency of the local television standard, either 59.94 <a href="/wiki/Hertz" title="Hertz">Hz</a> with <a href="/wiki/NTSC" title="NTSC">NTSC</a> systems, or 50.0 Hz (20 ms) with most <a href="/wiki/PAL" title="PAL">PAL</a> systems.<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> </p><p>1980s 8-bit Commodore computers, such as the <a href="/wiki/Commodore_PET" title="Commodore PET">PET</a> / <a href="/wiki/VIC-20" title="VIC-20">VIC-20</a> / <a href="/wiki/Commodore_64" title="Commodore 64">C64</a>, had a jiffy of 1/60 second, which was not dependent on the mains AC or video vertical refresh rate.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> A timer in the computer creates the 60 Hz rate, causing an interrupt service routine to be executed every 1/60 second, incrementing a 24-bit jiffy counter, scanning the keyboard, and handling some other housekeeping.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>Jiffy values for various <a href="/wiki/Linux" title="Linux">Linux</a> versions and platforms have typically varied between about 1 ms and 10 ms, with 10 ms (1/100 s) reported as an increasingly common standard in the <a href="/wiki/Jargon_File" title="Jargon File">Jargon File</a>.<sup id="cite_ref-JF_11-0" class="reference"><a href="#cite_note-JF-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Stratus_VOS" title="Stratus VOS">Stratus VOS</a> (Virtual Operating System) uses a jiffy of 1/65,536 second to express date and time (number of jiffies elapsed since <span class="nowrap">1 January 1980 00:00 <a href="/wiki/Greenwich_Mean_Time" title="Greenwich Mean Time">Greenwich Mean Time</a>)</span>. Stratus also defines the microjiffy, being 1/65,536 of a regular jiffy.<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> </p><p>The term <i>jiffy</i> is sometimes used in <a href="/wiki/Computer_animation" title="Computer animation">computer animation</a> as a method of defining playback rate, with the delay interval between individual frames specified in 1/100 of a second (10 ms) jiffies, particularly in <a href="/wiki/Autodesk_Animator" title="Autodesk Animator">Autodesk Animator</a> <a href="/wiki/.fli" class="mw-redirect" title=".fli">.FLI</a> sequences (one global frame frequency setting) and animated <a href="/wiki/CompuServe" title="CompuServe">Compuserve</a> <a href="/wiki/.GIF" class="mw-redirect" title=".GIF">.GIF</a> images (each frame having an individually defined display time measured in 1/100 s).<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> </p> <div class="mw-heading mw-heading3"><h3 id="Science">Science</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Jiffy_(time)&action=edit&section=5" title="Edit section: Science"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Speed_of_light" title="Speed of light">speed of light</a> in vacuum provides a convenient universal relationship between distance and time, so in <a href="/wiki/Physics" title="Physics">physics</a> (particularly in <a href="/wiki/Quantum_physics" class="mw-redirect" title="Quantum physics">quantum physics</a>) and often in <a href="/wiki/Chemistry" title="Chemistry">chemistry</a>, a jiffy is defined as the time taken for light to travel some specified distance. In <a href="/wiki/Astrophysics" title="Astrophysics">astrophysics</a> and quantum physics a jiffy is, as defined by <a href="/wiki/Edward_R._Harrison" class="mw-redirect" title="Edward R. Harrison">Edward R. Harrison</a>,<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> the time it takes for light to travel one <a href="/wiki/Fermi_(unit)" class="mw-redirect" title="Fermi (unit)">fermi</a>, which is approximately the size of a <a href="/wiki/Nucleon" title="Nucleon">nucleon</a>. One fermi is <span class="nowrap"><span data-sort-value="6985100000000000000♠"></span>10<sup>−15</sup> m</span>, so a jiffy is about <span class="nowrap"><span data-sort-value="6976299999999999999♠"></span>3<span style="margin-left:0.25em;margin-right:0.15em;">×</span>10<sup>−24</sup> s</span>. It has also more informally been defined as "one light-foot", which is equal to approximately one <a href="/wiki/Nanosecond" title="Nanosecond">nanosecond</a>.<sup id="cite_ref-JF_11-1" class="reference"><a href="#cite_note-JF-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p> <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=Jiffy_(time)&action=edit&section=6" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/System_time" title="System time">System time</a></li> <li><a href="/wiki/BogoMips" title="BogoMips">BogoMips</a> – which computes <code>loops_per_jiffy</code></li> <li><a href="/wiki/TU_(time_unit)" title="TU (time unit)">TU (time unit)</a></li> <li><a href="/wiki/Orders_of_magnitude_(time)" title="Orders of magnitude (time)">Orders of magnitude (time)</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Jiffy_(time)&action=edit&section=7" title="Edit section: 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 reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><i>The Town and Country Magazine</i>, vol. 12, <a rel="nofollow" class="external text" href="https://books.google.com/books?id=-wM3AAAAYAAJ&pg=PA88">p. 88</a>, February 1780.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></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 id="CITEREFDouglas_Harper2001" class="citation web cs1">Douglas Harper (November 2001). <a rel="nofollow" class="external text" href="http://www.etymonline.com/index.php?search=jiffy&searchmode=none">"jiffy"</a>. <i><a href="/wiki/Online_Etymology_Dictionary" title="Online Etymology Dictionary">Online Etymology Dictionary</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">2008-03-18</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Online+Etymology+Dictionary&rft.atitle=jiffy&rft.date=2001-11&rft.au=Douglas+Harper&rft_id=http%3A%2F%2Fwww.etymonline.com%2Findex.php%3Fsearch%3Djiffy%26searchmode%3Dnone&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJamieson1808" class="citation web cs1">Jamieson, John (1808). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Hjx2iKsucZQC&q=jiffie&pg=PA46-IA1">"jiffie"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2022-06-15</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=jiffie&rft.date=1808&rft.aulast=Jamieson&rft.aufirst=John&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3DHjx2iKsucZQC%26q%3Djiffie%26pg%3DPA46-IA1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" 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 id="CITEREFRelph1747" class="citation web cs1">Relph, Josiah (1747). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=3MQIAAAAQAAJ&dq=gliff&pg=PA2">"gliff"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2022-06-15</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=gliff&rft.date=1747&rft.aulast=Relph&rft.aufirst=Josiah&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D3MQIAAAAQAAJ%26dq%3Dgliff%26pg%3DPA2&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" class="Z3988"></span></span> </li> <li id="cite_note-numericana-5"><span class="mw-cite-backlink">^ <a href="#cite_ref-numericana_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-numericana_5-1"><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 id="CITEREFGerard_P._Michon2002" class="citation web cs1">Gerard P. Michon (November 2002). <a rel="nofollow" class="external text" href="http://www.numericana.com/answer/units.htm#jiffy">"What's a jiffy?"</a>. <i>Units of Measurement</i>. 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A Dictionary of Units of Measurement</i>. <a href="/wiki/University_of_North_Carolina" title="University of North Carolina">University of North Carolina</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2009-08-31</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=How+Many%3F+A+Dictionary+of+Units+of+Measurement&rft.atitle=jiffy&rft.date=2001-09&rft.au=Russ+Rowlett&rft_id=http%3A%2F%2Fwww.unc.edu%2F~rowlett%2Funits%2FdictJ.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" class="Z3988"></span></span> </li> <li id="cite_note-NOHZ-txt-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-NOHZ-txt_7-0">^</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://lwn.net/Articles/549593/">"Documentation/timers/NO_HZ.txt (3.10)"</a>. May 7, 2013.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Documentation%2Ftimers%2FNO_HZ.txt+%283.10%29&rft.date=2013-05-07&rft_id=https%3A%2F%2Flwn.net%2FArticles%2F549593%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" 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="http://man7.org/linux/man-pages/man7/time.7.html">"time(7) - Linux manual page"</a>. <i><a href="/wiki/Michael_Kerrisk" title="Michael Kerrisk">man7.org</a></i>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=man7.org&rft.atitle=time%287%29+-+Linux+manual+page&rft_id=http%3A%2F%2Fman7.org%2Flinux%2Fman-pages%2Fman7%2Ftime.7.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" class="Z3988"></span></span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</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.c64-wiki.com/wiki/TIME">"TIME"</a>. <i>C64 Wiki</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20230302044648/https://www.c64-wiki.com/wiki/TIME">Archived</a> from the original on 2023-03-02.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=C64+Wiki&rft.atitle=TIME&rft_id=https%3A%2F%2Fwww.c64-wiki.com%2Fwiki%2FTIME&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</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://c64os.com/post/howthekeyboardworks">"How the C64 Keyboard Works"</a>. <i>C64 OS</i>. October 23, 2017. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20230302051942/https://c64os.com/post/howthekeyboardworks">Archived</a> from the original on March 2, 2023.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=C64+OS&rft.atitle=How+the+C64+Keyboard+Works&rft.date=2017-10-23&rft_id=https%3A%2F%2Fc64os.com%2Fpost%2Fhowthekeyboardworks&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" class="Z3988"></span></span> </li> <li id="cite_note-JF-11"><span class="mw-cite-backlink">^ <a href="#cite_ref-JF_11-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-JF_11-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://catb.org/~esr/jargon/html/J/jiffy.html">Entry on <i>jiffy</i></a> in <a href="/wiki/The_Jargon_File" class="mw-redirect" title="The Jargon File">The Jargon File</a></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://stratadoc.stratus.com/vos/15.1.1/r021-08/wwhelp/wwhimpl/common/html/wwhelp.htm?context=r021-08&file=ch1r021-08m.html">"StrataDOC - Time Intervals"</a>. <a href="/wiki/Stratus_Technologies" title="Stratus Technologies">Stratus</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2018-11-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=StrataDOC+-+Time+Intervals&rft.pub=Stratus&rft_id=https%3A%2F%2Fstratadoc.stratus.com%2Fvos%2F15.1.1%2Fr021-08%2Fwwhelp%2Fwwhimpl%2Fcommon%2Fhtml%2Fwwhelp.htm%3Fcontext%3Dr021-08%26file%3Dch1r021-08m.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJiffy+%28time%29" 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">"The Cosmic Numbers" in <i>Cosmology, The Science of the Universe</i>, 1981 <a href="/wiki/Cambridge_University_Press" title="Cambridge University Press">Cambridge Press</a></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a 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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 href="/wiki/ISO_8601" title="ISO 8601">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, 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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 class="mw-selflink selflink">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><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" 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