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window.TAD=window.TAD||{};TAD.abtest='a'; </script><div class=bc__wrap><div class="row socrow"><div id=bc class="fixed"><div id=bct><a target=_top href="/" class=fx>Home</a>   <a target=_top href="/calendar/" class=fx>Calendar</a>   When Does the Decade Start?</div></div></div></div><main class="article layout-grid layout-grid--article"><article class="layout-grid__main article__content"><h1 class=article__title>When Does the Decade Start?</h1><h4 class=article__sub-title></h4><p class=article__byline>By <a href='/company/team-editorial#kb'>Konstantin Bikos</a></p><p class=article__lead>On January 1, 2030, people will welcome the beginning of the thirties. But will they be celebrating one year too early?</p><div class=article__body><figure class="article__figure "><div class=article__img-container><img src="//c.tadst.com/gfx/600x337/new-year-saas-fee.jpg?1" width=600 height=337 alt="People watching fireworks above a mountain village." class=article__img srcset="//c.tadst.com/gfx/900x506/new-year-saas-fee.jpg?1 1.5x,//c.tadst.com/gfx/1200x675/new-year-saas-fee.jpg?1 2x"></div><figcaption><p class=article__img-caption>Fireworks in Saas-Fee, Switzerland</p><p class=article__img-credit>©iStockphoto.com/Stephane_Jaquemet</p></figcaption></figure><p>In other words, do decades officially begin with years ending in 0 or years ending in 1? Well, both are correct! It only depends on the words you use to describe decades. Let us explain.</p><h2>Do Decades Begin with Round Years...</h2><p>At first glance, it all looks logical and straightforward. Decades—periods of ten years—begin when the year count ticks over from a year ending with 9 to a year ending with 0.</p><p>For example, <a href="/holidays/common/new-year-day">New Year's Day</a> 1980 marked the beginning of the eighties. After all, they are called “the eighties” and not “the eighty-ones,” right?</p><h2>...When Centuries and Millennia Don't?</h2><p>Well, it does get a little more complicated when we look at centuries and millennia. Contrary to popular belief, the 21st century and the third millennium <a href="/counters/mil2000.html">did not begin on January 1, 2000</a>, but one year later, on New Year's Day 2001.</p><p class=large-link><a href="/calendar/days/first-day-of-the-week.html">What is the first day of the week?</a></p><p>This may seem counterintuitive at first, but it is a consequence of a defining feature of our modern <a href="/calendar/ce-bce-what-do-they-mean.html"><em>anno domini</em></a> time reckoning system: There was never a year zero, and year 1 BC was followed by year AD 1. <a href="/counters/mil2000.html" class=read-more>Read an explanation</a></p><h2>The Thirties Will Begin in 2030</h2><p>So, how come this rule doesn't apply to decades? Why do we claim that they can start with years ending in 0 <em>or</em> years ending in 1?</p><p>It all comes down to how we talk about time spans. With few exceptions, we usually think about centuries and millennia as numbered entities, counted up from year AD 1, such as “the 21st century” or “the third millennium.”</p><p>Decades, however, are commonly categorized based on the year numbers. For example, we say “the eighties” instead of “the 199th decade.” Similarly, the upcoming decade is technically the 204th decade, but we'll call it “the thirties.” According to this common definition, decades generally encompass the time span from years ending with 0 to years ending with 9, such as 2030 – 2039.</p><p class=large-link><a href="/counters/new-year-trivia.html">10 cool facts about the New Year</a></p><p>By the way, the same could technically be said about centuries and millennia. It is factually correct to say that “the 1900s” began on January 1, 1900, just like New Year's Day 2000 kicked off “the 2000s.” It's just much more common to call these time spans the 20th and 21st centuries—and they began in 1901 and 2001, respectively.</p><h2>You Can Celebrate Twice</h2><p>So, in essence, both are correct. You only need to make sure that the year you state as the first year of a decade, century, or millennium matches the term you use to describe it.</p><p>Equipped with this knowledge, you can go ahead and party extra hearty two years in a row at the beginning of the next decade: to welcome the thirties on January 1, 2030, and to celebrate the start of the 204th decade when the <a href="/countdown/newyear">New Year Countdown</a> reaches zero at midnight on January 1, 2031!</p><h2>What Are the First Two Decades Called?</h2><p>Did you know that we lived through two whole decades without managing to name them consistently? We don't think twice about using terms like the seventies, the eighties, and the nineties—but what comes next?</p><p>In recent years, the English-speaking world has pretty much settled on a name for the period from 2000 to 2009, but there are regional variations. North America favors the term “the aughts,” while most other English-speaking countries mostly use “the noughts” or “the noughties.”</p><p>However, the jury is still out on the name of the time span from 2010 to 2019. Suggestions abound, ranging from “the teens,” “the teenies,” and “the teensies” to “the tens,” “the tensies,” and even “the ten-sions.” Depending on context, it is also common to use terms like “the twenty-tens” or “the two-thousand-and-tens.” But so far, none of them have secured enough support in everyday use to decide the race.</p><p>It may seem strange that we managed to let ten years fly by without having a clear understanding of what to call them. However, it is quite common for these things to be decided in hindsight. Time will tell which name we finally settle on.</p><p class=article__htags><strong>Topics: </strong><a href="/topics/calendar">Calendar</a>, <a href="/topics/history">History</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=2025></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 selected>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>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 active"> When Do Decades Start? </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--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 </a></p></div></div><div class="clip-block clip-block--tool"><h3><a href="/calendar/weekdays.html">When is the next occurrence of</a></h3><form class=inline method=get action="/scripts/goweekdays.php"><select id=day name=day><option value=1>1</option><option value=2>2</option><option value=3>3</option><option value=4>4</option><option value=5>5</option><option value=6>6</option><option value=7>7</option><option value=8>8</option><option value=9>9</option><option value=10>10</option><option value=11>11</option><option value=12>12</option><option value=13>13</option><option value=14>14</option><option value=15>15</option><option value=16>16</option><option value=17 selected>17</option><option value=18>18</option><option value=19>19</option><option value=20>20</option><option value=21>21</option><option value=22>22</option><option value=23>23</option><option value=24>24</option><option value=25>25</option><option value=26>26</option><option value=27>27</option><option value=28>28</option><option value=29>29</option><option value=30>30</option><option value=31>31</option></select> <select id=weekd name=weekd><option value=7>Sunday</option><option value=1 selected>Monday</option><option value=2>Tuesday</option><option value=3>Wednesday</option><option value=4>Thursday</option><option value=5>Friday</option><option value=6>Saturday</option></select> <input type=submit value=Go></form><h3><a href="/calendar/repeating.html">Which years use the same calendar</a></h3><form class=inline method=get action="/calendar/repeating.html"><input placeholder=yyyy type=text tad-va=date onfocus="window.ifc&&ifc(this,'y')" pattern="[0-9]*" maxlength=4 size=5 id=y_year name=year title="Enter year as a 4-digit number." value=2025> <input type=submit value=Show></form><h3><a href="/calendar/repeating-month.html">Which months are the same</a></h3><form class=inline method=get action="/calendar/repeating-month.html"><input placeholder=yyyy type=text tad-va=date onfocus="window.ifc&&ifc(this,'y')" pattern="[0-9]*" maxlength=4 size=5 id=year name=year title="Enter year as a 4-digit number." value=2025> <input tad-va=date placeholder=mm type=text onfocus="window.ifc&&ifc(this,'m')" maxlength=12 size=3 id="month" name="month" title="Please enter the month of the year as a one or two-digit number, or as a name. The valid numeric range is from 1 to 12, and valid names, for example, are 'Oct' or 'October'." value=2> <input type=submit value=Show></form></div><article class="card "><a href="/countdown/newyear" class=card__link aria-label="Countdown to New Year"><div class=card__img-wrap><img src="//c.tadst.com/gfx/300x168/new-year-countdown.png?1" width=300 height=168 alt="Illustration image" class=card__img srcset="//c.tadst.com/gfx/450x252/new-year-countdown.png?1 1.5x,//c.tadst.com/gfx/600x337/new-year-countdown.png?1 2x"></div><section class=card__content><h4 class=card__title>Countdown to New Year</h4><p class=card__text>How many days until New Year? 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