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class=article__sub-title></h4><p class=article__byline>By <a href='/company/team-editorial#vh'>Vigdis Hocken</a></p><p class=article__lead>A year is divided into 12 months in the modern-day <a href="/calendar/gregorian-calendar.html">Gregorian calendar</a>. The months are either 28, 29, 30, or 31 days long.</p><div class=article__body><figure class="article__figure article__figure--zoomable" data-tad-control=ClassOnClick data-tad-options="{classname: 'article__figure--zoomed'}"><div class=article__img-container><img src="//c.tadst.com/gfx/600x337/calendar-2024-printable.png?1" width=600 height=337 title="Calendar 2024 with 12 months" alt="Calendar 2024 with 12 months | Printable Calendar" class=article__img srcset="//c.tadst.com/gfx/900x506/calendar-2024-printable.png?1 1.5x,//c.tadst.com/gfx/1200x675/calendar-2024-printable.png?1 2x"></div><div class=article__lightbox><img src="//c.tadst.com/gfx/1200x675/calendar-2024-printable.png?1" width=1200 height=675 title="Calendar 2024 with 12 months" alt="Calendar 2024 with 12 months | Printable Calendar" class=article__img-large loading=lazy></div><figcaption><p class=article__img-caption>The Gregorian calendar is made up of 12 months, each between 28 and 31 days long.</p></figcaption></figure><div class="pdt10 pdb25"><a class="tad-cta " href="/calendar/" style="--cta-color-bg: var(--color-green-55);--cta-color-hover: var(--color-green-65);"><svg class="tad-icon tad-cta__icon"><use xlink:href="#icon-arrow-forward"></use></svg>Create Your Calendar </a></div><p>Each month has either 28, 30, or 31 days during a <a href="/date/common-year.html">common year</a>, which has 365 days. During <a href="/date/leapyear.html">leap years</a>, which occur nearly every 4 years, we add an extra (intercalary) day, <a href="/date/leap-day.html">Leap Day</a>, on 29 February, making leap years 366 days long.</p><p>This is to keep our <a href="/calendar/">current calendar</a> aligned with the <a href="/astronomy/tropical-year.html">solar year</a> and <a href="/calendar/seasons.html">astronomical seasons</a> marked by <a href="/calendar/march-equinox.html">equinoxes</a> and <a href="/calendar/june-solstice.html">solstices</a>.</p><h2>The 12 Months</h2><p>The <a href="/calendar/gregorian-calendar.html">Gregorian calendar</a> consists of the following 12 months:</p><ol><li><a href="/calendar/months/january.html">January</a> - 31 days</li><li><a href="/calendar/months/february.html">February</a> - 28 days in a <a href="/date/common-year.html">common year</a> and 29 days in <a href="/date/leapyear.html">leap years</a></li><li><a href="/calendar/months/march.html">March</a> - 31 days</li><li><a href="/calendar/months/april.html">April</a> - 30 days</li><li><a href="/calendar/months/may.html">May</a> - 31 days</li><li><a href="/calendar/months/june.html">June</a> - 30 days</li><li><a href="/calendar/months/july.html">July</a> - 31 days</li><li><a href="/calendar/months/august.html">August</a> - 31 days</li><li><a href="/calendar/months/september.html">September</a> - 30 days</li><li><a href="/calendar/months/october.html">October</a> - 31 days</li><li><a href="/calendar/months/november.html">November</a> - 30 days</li><li><a href="/calendar/months/december.html">December</a> - 31 days</li></ol><h2>Tracking the Moon’s Orbit</h2><p>The months originated as a way to mark time and break up the year into shorter periods based on the <a href="/astronomy/moon/lunar-perigee-apogee.html">Moon’s orbit</a> around Earth. The word <em>month</em> is even derived from the word <em>Moon</em>.</p><p>As far as we know, months were first used in Mesopotamia sometime between the years 500 <a href="/calendar/ce-bce-what-do-they-mean.html">BCE</a> and 400 BCE to measure the natural period related to the <a href="/astronomy/moon/lunar-month.html">lunar month</a>, or synodic month, which is the time it takes for the Moon to go through all the <a href="/astronomy/moon/phases.html">Moon phases</a>.</p><p class=large-link><a href="/moon/phases/" class=read-more>Moon phases in your city</a></p><h2>How Many Have 28, 29, 30, or 31 Days?</h2><p>The Gregorian calendar has 4 months that are 30 days long and 7 months that are 31 days long. February is the only month that is 28 days long in common years and 29 days long in leap years.</p><h2>From 10 to 12 Months</h2><p>Our current <a href="/calendar/gregorian-calendar.html">Gregorian calendar</a> and its predecessor, the <a href="/calendar/julian-calendar.html">Julian calendar</a>, both have 12 months. However, the month names we use today are derived from the <a href="/calendar/roman-calendar.html">Roman calendar</a>, which initially had only 10 months, with the calendar year starting in March (<em>Martius</em>).</p><p class=large-link><a href="/calendar/">Calendar with holidays</a></p><p>The Romans named some of the months after their position in the calendar year: <a href="/calendar/months/september.html">September</a> means the 7th month, <a href="/calendar/months/october.html">October</a> the 8th, <a href="/calendar/months/november.html">November</a> the 9th, and <a href="/calendar/months/december.html">December</a> the 10th month. However, when <a href="/calendar/months/january.html">January</a> and <a href="/calendar/months/february.html">February</a> were eventually added and the beginning of the calendar year was moved to January, the position of these months no longer corresponded with the original meaning of their names. Today, we still call the 9th month of the year September, the 7th month.</p><p>The <a href="/calendar/islamic-calendar.html">Islamic calendar</a>, the <a href="/calendar/jewish-calendar.html">Hebrew calendar</a>, and the <a href="/calendar/hindu-calendar.html">Hindu calendar</a> also use months to divide up the year. Although the Gregorian calendar is the most commonly used calendar today, other calendars are still used in many parts of the world to calculate certain holidays and annual feasts.</p><h2>Old Names of Months</h2><p>Months in the ancient <a href="/calendar/roman-calendar.html">Roman calendar</a> include:</p><ul><li>Mercedonius - an occasional month after February that would be used to realign the Roman calendar. Today we use <a href="/date/leap-day.html">Leap Day</a> for this alignment.</li><li>Quintilis - renamed <a href="/calendar/months/july.html">July</a> in honor of Julius Caesar in 44 BCE.</li><li>Sextilis - renamed <a href="/calendar/months/august.html">August</a> in honor of Roman Emperor Augustus in 8 BCE.</li></ul><p class=article__htags><strong>Topics: </strong><a href="/topics/january">January</a>, <a href="/topics/february">February</a>, <a href="/topics/march">March</a>, <a href="/topics/april">April</a>, <a href="/topics/may">May</a>, <a href="/topics/june">June</a>, <a href="/topics/july">July</a>, <a href="/topics/august">August</a>, <a href="/topics/september">September</a>, <a href="/topics/october">October</a>, <a href="/topics/november">November</a>, <a href="/topics/december">December</a>, <a href="/topics/months">Months</a>, <a href="/topics/calendar">Calendar</a></p></div></article><aside class="layout-grid__sidebar article__sidebar"><div class="clip-block clip-block--calendar"><h3 class=clip-block__title>Create Calendar With Holidays</h3><form name=cf id=cf class="small ten" method=get action="/scripts/createcal2.php"><div class=form-row><label class="inline six"><input type=radio name=typ value=0 checked>Full year</label><input placeholder=yyyy type=text autocomplete=off tad-va=date onfocus="window.ifc&&ifc(this,'y')" pattern="[0-9]*" maxlength=4 size=9 id=boxyear name=year title="Enter year as a 4-digit number." class=six value=2024></div><div class=form-row><label class="inline six"><input type=radio name=typ value=1>Month</label><select id=month name=month class="inline six" onchange='document.cf.typ[1].checked=true'><option value=1>January</option><option value=2>February</option><option value=3>March</option><option value=4>April</option><option value=5>May</option><option value=6>June</option><option value=7>July</option><option value=8>August</option><option value=9>September</option><option value=10>October</option><option value=11 selected>November</option><option value=12>December</option></select></div><div class=form-row><select id=country name=country class="inline twelve" title="Select country"><option value=29>Australia</option><option value=27>Canada</option><option value=35>India</option><option value=32>Ireland</option><option value=30>New Zealand</option><option value=9>United Kingdom</option><option value=1>United States</option><option value=160>Afghanistan</option><option value=93>Albania</option><option value=123>Algeria</option><option value=207>American Samoa</option><option value=97>Andorra</option><option value=127>Angola</option><option value=217>Anguilla</option><option value=221>Antigua and Barbuda</option><option value=37>Argentina</option><option value=102>Armenia</option><option value=177>Aruba</option><option value=29>Australia</option><option value=36>Austria</option><option value=85>Azerbaijan</option><option value=110>Bahamas</option><option value=133>Bahrain</option><option value=233>Bangladesh</option><option value=112>Barbados</option><option value=83>Belarus</option><option value=31>Belgium</option><option value=193>Belize</option><option value=148>Benin</option><option value=113>Bermuda</option><option value=198>Bhutan</option><option value=53>Bolivia</option><option value=86>Bosnia and Herzegovina</option><option value=144>Botswana</option><option value=33>Brazil</option><option value=224>British Virgin Islands</option><option value=79>Brunei</option><option value=73>Bulgaria</option><option value=165>Burkina Faso</option><option value=166>Burundi</option><option value=140>Cambodia</option><option value=134>Cameroon</option><option value=27>Canada</option><option value=157>Cape Verde</option><option value=111>Cayman Islands</option><option value=167>Central African Republic</option><option value=161>Chad</option><option value=43>Chile</option><option value=41>China</option><option value=46>Colombia</option><option value=172>Comoros</option><option value=84>Congo DR</option><option value=208>Cook Islands</option><option value=58>Costa Rica</option><option value=28>Croatia</option><option value=51>Cuba</option><option value=189>Curaçao</option><option value=94>Cyprus</option><option value=3>Czechia</option><option value=2>Denmark</option><option value=153>Djibouti</option><option value=229>Dominica</option><option value=52>Dominican Republic</option><option value=49>Ecuador</option><option value=80>Egypt</option><option value=55>El Salvador</option><option value=61>Equatorial Guinea</option><option value=168>Eritrea</option><option value=72>Estonia</option><option value=81>Ethiopia</option><option value=219>Falkland Islands</option><option value=175>Faroe Islands</option><option value=180>Fiji</option><option value=24>Finland</option><option value=5>France</option><option value=235>French Guiana</option><option value=205>French Polynesia</option><option value=150>Gabon</option><option value=149>Gambia</option><option value=87>Georgia</option><option value=8>Germany</option><option value=118>Ghana</option><option value=119>Gibraltar</option><option value=11>Greece</option><option value=138>Greenland</option><option value=22>Gregorian calendar</option><option value=182>Grenada</option><option value=236>Guadeloupe</option><option value=188>Guam</option><option value=50>Guatemala</option><option value=191>Guernsey</option><option value=169>Guinea</option><option value=173>Guinea-Bissau</option><option value=227>Guyana</option><option value=103>Haiti</option><option value=54>Honduras</option><option value=42>Hong Kong</option><option value=12>Hungary</option><option value=88>Iceland</option><option value=35>India</option><option value=65>Indonesia</option><option value=75>Iran</option><option value=109>Iraq</option><option value=32>Ireland</option><option value=234>Isle of Man</option><option value=34>Israel</option><option value=13>Italy</option><option value=125>Ivory Coast</option><option value=117>Jamaica</option><option value=26>Japan</option><option value=192>Jersey</option><option value=44>Jordan</option><option value=23>Julian calendar</option><option value=82>Kazakhstan</option><option value=105>Kenya</option><option value=194>Kiribati</option><option value=120>Kosovo</option><option value=108>Kuwait</option><option value=136>Kyrgyzstan</option><option value=176>La Réunion</option><option value=200>Laos</option><option value=89>Latvia</option><option value=121>Lebanon</option><option value=163>Lesotho</option><option value=129>Liberia</option><option value=124>Libya</option><option value=96>Liechtenstein</option><option value=90>Lithuania</option><option value=17>Luxembourg</option><option value=186>Macau</option><option value=156>Madagascar</option><option value=162>Malawi</option><option value=69>Malaysia</option><option value=201>Maldives</option><option value=152>Mali</option><option value=95>Malta</option><option value=213>Marshall Islands</option><option value=181>Martinique</option><option value=210>Mauritania</option><option value=143>Mauritius</option><option value=171>Mayotte</option><option value=40>Mexico</option><option value=211>Micronesia</option><option value=91>Moldova</option><option value=99>Monaco</option><option value=185>Mongolia</option><option value=101>Montenegro</option><option value=220>Montserrat</option><option value=106>Morocco</option><option value=126>Mozambique</option><option value=190>Myanmar</option><option value=130>Namibia</option><option value=215>Nauru</option><option value=187>Nepal</option><option value=204>New Caledonia</option><option value=30>New Zealand</option><option value=57>Nicaragua</option><option value=158>Niger</option><option value=77>Nigeria</option><option value=237>Norfolk Island</option><option value=183>North Korea</option><option value=92>North Macedonia</option><option value=225>Northern Mariana Islands</option><option value=18>Norway</option><option value=135>Oman</option><option value=64>Pakistan</option><option value=212>Palau</option><option value=60>Panama</option><option value=202>Papua New Guinea</option><option value=56>Paraguay</option><option value=47>Peru</option><option value=67>Philippines</option><option value=14>Poland</option><option value=15>Portugal</option><option value=114>Puerto Rico</option><option value=107>Qatar</option><option value=151>Republic of the Congo</option><option value=19>Romania</option><option value=20>Russia</option><option value=128>Rwanda</option><option value=232>Saint Barthélemy</option><option value=170>Saint Helena</option><option value=226>Saint Kitts and Nevis</option><option value=218>Saint Lucia</option><option value=231>Saint Martin</option><option value=228>Saint Pierre and Miquelon</option><option value=222>Saint Vincent and the Grenadines</option><option value=206>Samoa</option><option value=98>San Marino</option><option value=174>São Tomé and Príncipe</option><option value=74>Saudi Arabia</option><option value=147>Senegal</option><option value=38>Serbia</option><option value=154>Seychelles</option><option value=164>Sierra Leone</option><option value=63 selected>Singapore</option><option value=230>Sint Maarten</option><option value=39>Slovakia</option><option value=45>Slovenia</option><option value=209>Solomon Islands</option><option value=137>Somalia</option><option value=62>South Africa</option><option value=70>South Korea</option><option value=146>South Sudan</option><option value=16>Spain</option><option value=116>Sri Lanka</option><option value=145>Sudan</option><option value=178>Suriname</option><option value=155>Swaziland</option><option value=21>Sweden</option><option value=10>Switzerland</option><option value=132>Syria</option><option value=71>Taiwan</option><option value=197>Tajikistan</option><option value=115>Tanzania</option><option value=68>Thailand</option><option value=25>The Netherlands</option><option value=199>Timor-Leste</option><option value=159>Togo</option><option value=195>Tonga</option><option value=104>Trinidad and Tobago</option><option value=122>Tunisia</option><option value=4>Turkey</option><option value=196>Turkmenistan</option><option value=223>Turks and Caicos Islands</option><option value=214>Tuvalu</option><option value=179>U.S. Virgin Islands</option><option value=139>Uganda</option><option value=76>Ukraine</option><option value=66>United Arab Emirates</option><option value=9>United Kingdom</option><option value=1>United States</option><option value=59>Uruguay</option><option value=184>Uzbekistan</option><option value=203>Vanuatu</option><option value=100>Vatican City</option><option value=48>Venezuela</option><option value=78>Vietnam</option><option value=216>Wallis and Futuna</option><option value=131>Yemen</option><option value=142>Zambia</option><option value=141>Zimbabwe</option></select></div><div class=form-row><input type=submit value="View Calendar"></div></form></div><div class="clip-block clip-block--list"><div class=blk-series><h3 class="blk-series__title clip-block__title">Calendar History</h3><ol class=blk-series__list><li class="blk-series__item "><a href="/calendar/gregorian-calendar.html" class=blk-series__item-link> Gregorian Calendar </a></li><li class="blk-series__item "><a href="/calendar/julian-calendar.html" class=blk-series__item-link> Julian Calendar </a></li><li class="blk-series__item "><a href="/calendar/julian-gregorian-switch.html" class=blk-series__item-link> Switch from Julian to Gregorian </a></li><li class="blk-series__item "><a href="/calendar/roman-calendar.html" class=blk-series__item-link> Roman Calendar </a></li><li class="blk-series__item "><a href="/calendar/ce-bce-what-do-they-mean.html" class=blk-series__item-link> What Do CE and BCE Mean? </a></li><li class="blk-series__item "><a href="/calendar/how-do-roman-numerals-work.html" class=blk-series__item-link> How To Write and Count Roman Numerals </a></li><li class="blk-series__item "><a href="/calendar/decade.html" class=blk-series__item-link> When Do Decades Start? </a></li><li class="blk-series__item "><a href="/counters/mil2000.html" class=blk-series__item-link> Did the Millennium Start in 2000 or 2001? </a></li><li class="blk-series__item "><a href="/calendar/what-is-a-calendar.html" class=blk-series__item-link> What Is a Calendar? </a></li></ol><p class=blk-series__footer><a href="/calendar/info.html" class=read-more> All About Calendars </a></p></div></div><div class="clip-block clip-block--picker"><h3 class=clip-block__title><a href="/holidays/">Holidays and Observances</a></h3><form action="/holidays/search.html" class="picker-city "><input type=search autocomplete=off class=picker-city__input placeholder="Holiday or country…" onfocus="ifc(this, 'hol', 1 )" name=query><button type=submit class=picker-city__button title=Search><i class="i-font i-search"></i></button></form></div><div class="clip-block clip-block--list"><div class=blk-series><h3 class="blk-series__title clip-block__title">Calendars Worldwide</h3><ol class=blk-series__list><li class="blk-series__item "><a href="/calendar/gregorian-calendar.html" class=blk-series__item-link> Gregorian Calendar </a></li><li class="blk-series__item "><a href="/calendar/julian-calendar.html" class=blk-series__item-link> Julian Calendar </a></li><li class="blk-series__item "><a href="/calendar/hindu-calendar.html" class=blk-series__item-link> Hindu Calendar </a></li><li class="blk-series__item "><a href="/calendar/buddhist-calendar.html" class=blk-series__item-link> Buddhist Calendar </a></li><li class="blk-series__item "><a href="/calendar/islamic-calendar.html" class=blk-series__item-link> Islamic Calendar </a></li><li class="blk-series__item "><a href="/calendar/jewish-calendar.html" class=blk-series__item-link> Jewish Calendar </a></li><li class="blk-series__item "><a href="/calendar/persian-calendar.html" class=blk-series__item-link> Persian Calendar </a></li><li class="blk-series__item "><a href="/calendar/about-chinese.html" class=blk-series__item-link> Chinese Calendar </a></li><li class="blk-series__item "><a href="/calendar/bahai-calendar.html" class=blk-series__item-link> Baháʼí Calendar </a></li><li class="blk-series__item "><a href="/calendar/tamil-calendar.html" class=blk-series__item-link> Tamil Calendar </a></li><li class="blk-series__item "><a href="/calendar/coptic-calendar.html" class=blk-series__item-link> Coptic Calendar </a></li><li class="blk-series__item "><a href="/calendar/ethiopia-calendar.html" class=blk-series__item-link> Ethiopian Calendar </a></li><li class="blk-series__item "><a href="/calendar/revised-julian-calendar.html" class=blk-series__item-link> Revised Julian Calendar </a></li><li class="blk-series__item "><a href="/calendar/mayan.html" class=blk-series__item-link> Mayan Calendar </a></li></ol><p class=blk-series__footer><a href="/calendar/info.html" class=read-more> Calendar Services 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