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layout-grid--article"><article class="layout-grid__main article__content"><h1 class="article__title">Date Pattern Calculator</h1><h4 class="article__sub-title"></h4><p class="article__byline"></p><p class="article__lead">Want to know if the digits in a date are sequential, repetitive, or can be read the same way forwards and backwards? Use the Date Pattern Calculator to find out unique and interesting mathematical patterns in different date formats.</p><div class="article__body"><p>Click on <strong>Advanced options</strong> to select a different pattern type, change the date order, include the time, and more.</p><form name="f" class="ff" method="get" action="/web/20210326211033/https://www.timeanddate.com/scripts/gopattern.php"><h2 class="mgt0">Select search parameters:</h2><select id="per" name="per" onchange="perc()"><option value="date" selected>Single date</option><option value="month">Full month</option><option value="year">Full year</option></select><table id="perd0"><tr><td class="ml"><label for="p1m">Month:</label></td><td><input tad-va="date" placeholder="mm" type="text" autocomplete="off" onfocus="ifc(this,'m')" maxlength="12" size="3" id="p1m" name="p1m" 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="3"></td><td class="ml"><label for="p1d">Day:</label></td><td><input tad-va="date" placeholder="dd" type="text" autocomplete="off" onfocus="ifc(this,'d')" pattern="[0-9]*" maxlength="2" size="3" id="p1d" name="p1d" title="Please enter the day of the month as a one or two-digit number. The valid range is from 1 to 31." value="26"></td><td class="ml"><label for="p1y">Year:</label></td><td><input placeholder="yyyy" type="text" autocomplete="off" tad-va="date" onfocus="ifc(this,'y')" pattern="[0-9]*" maxlength="4" size="5" id="p1y" name="p1y" title="Enter year as a 4-digit number." value="2021"></td><td><script type="text/javascript"> TAD=window.TAD||{};TAD.dayord="M\/d\/y";TAD.timord="h:m:s";TAD.ftime="h:mm:ss aa";TAD.fyear=1753;TAD.lyear=2099;TAD.co="us";TAD.fdow=0;TAD.dn1=['S','M','T','W','T','F','S'];TAD.fmn=['January','February','March','April','May','June','July','August','September','October','November','December']; </script><button type="button" class="btn-datepicker" onclick="calp(this, 'p1')" title="Select date">   </button></td></tr></table><table id="perd1" class="dn "><tr><td class="ml"><label for="p2m">Month:</label></td><td><input tad-va="date" placeholder="mm" type="text" autocomplete="off" onfocus="ifc(this,'m')" maxlength="12" size="3" id="p2m" name="p2m" 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="3"></td><td class="ml"><label for="p2y">Year:</label></td><td><input placeholder="yyyy" type="text" autocomplete="off" tad-va="date" onfocus="ifc(this,'y')" pattern="[0-9]*" maxlength="4" size="5" id="p2y" name="p2y" title="Enter year as a 4-digit number." value="2021"></td></tr></table><table id="perd2" class="dn "><tr><td class="ml"><label for="p3y">Year:</label></td><td><input placeholder="yyyy" type="text" autocomplete="off" tad-va="date" onfocus="ifc(this,'y')" pattern="[0-9]*" maxlength="4" size="5" id="p3y" name="p3y" title="Enter year as a 4-digit number." value="2021"></td></tr></table><input type="checkbox" name="patcb" id="patcb" value="1" onclick="patcc()"><label for="patcb">Advanced options</label><div id="patv" class="dn"><div class="three columns"><label for="patt">Pattern types</label><select id="patt" name="patt"><option value="0" selected>All</option><option value="1">Repetitive</option><option value="2">Reversible</option></select></div><div class="three columns"><label for="pato">Date order</label><select id="pato" name="pato"><option value="0" selected>All date orders</option><option value="1">Year-Month-Day</option><option value="2">Day-Month-Year</option><option value="4">Month-Day-Year</option></select></div><div class="three columns"><label for="pati">Include time in pattern</label><select id="pati" name="pati"><option value="0">No times</option><option value="1">Hours only</option><option value="2">Hours and minutes</option><option value="4" selected>Hours, minutes, seconds</option></select></div><div class="three columns"><label for="pata">Amount of patterns</label><select id="pata" name="pata"><option value="0" selected>Normal</option><option value="2">Only good ones</option><option value="1">Look for more</option></select></div></div><br><input type="submit" value="Look for Patterns"></form><h2>24 patterns found for Friday, March 26, 2021</h2><p>Click on any row to see an animation of the date pattern.</p><div class="tb-scroll"><table class="table table--inner-borders-rows table--striped table--hover"><thead><tr><th>Readable Date</th><th>Order of Date</th><th>Grouped as Date</th><th>Grouped as Pattern</th><th>Type</th></tr></thead><tbody><tr><td>Mar 26 at 12:06:23 am</td><td>M-DD H:MI:SS</td><td>3-26 0:06:23</td><td>3260-0623</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 12:26:30 am</td><td>DD-M H:MI:SS</td><td>26-3 0:26:30</td><td>2630-2630</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26 at 1:16:23 am</td><td>M-DD H:MI:SS</td><td>3-26 1:16:23</td><td>3261-1623</td><td class="pat2">Palindrome (reverse)</td></tr><tr><td>Mar 26, 2021 at 1:26:23 am</td><td>M-DD-YY HH:MI:SS</td><td>3-26-21 01:26:23</td><td>32621-0-12623</td><td class="pat2">Palindrome (reverse)</td></tr><tr><td>Mar 26, 2021 at 1:26:23 am</td><td>M-DD-YY H:MI:SS</td><td>3-26-21 1:26:23</td><td>32621-12623</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 1:26:31 am</td><td>DD-M H:MI:SS</td><td>26-3 1:26:31</td><td>2631-2631</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26 at 2:26:23 am</td><td>M-DD H:MI:SS</td><td>3-26 2:26:23</td><td>3262-2623</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 2:26:32 am</td><td>DD-M H:MI:SS</td><td>26-3 2:26:32</td><td>2632-2632</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26, 2021 at 2:30:12 am</td><td>YY-MM-DD H:MI:SS</td><td>21-03-26 2:30:12</td><td>21032-6-23012</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 3:26:33 am</td><td>DD-M H:MI:SS</td><td>26-3 3:26:33</td><td>2633-2633</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26 at 3:36:23 am</td><td>M-DD H:MI:SS</td><td>3-26 3:36:23</td><td>3263-3623</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 4:26:34 am</td><td>DD-M H:MI:SS</td><td>26-3 4:26:34</td><td>2634-2634</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26 at 4:46:23 am</td><td>M-DD H:MI:SS</td><td>3-26 4:46:23</td><td>3264-4623</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 5:26:35 am</td><td>DD-M H:MI:SS</td><td>26-3 5:26:35</td><td>2635-2635</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26 at 5:56:23 am</td><td>M-DD H:MI:SS</td><td>3-26 5:56:23</td><td>3265-5623</td><td class="pat2">Palindrome (reverse)</td></tr><tr><td>Mar 26 at 6:23 am</td><td>M-DD H:MI</td><td>3-26 6:23</td><td>326-623</td><td class="pat2">Palindrome (reverse)</td></tr><tr class="hl"><td>Mar 26 at 6:26:36 am</td><td>DD-M H:MI:SS</td><td>26-3 6:26:36</td><td>2636-2636</td><td class="pat1">Repeats 4 x 2</td></tr><tr class="hl"><td>Mar 26 at 7:26:37 am</td><td>DD-M H:MI:SS</td><td>26-3 7:26:37</td><td>2637-2637</td><td class="pat1">Repeats 4 x 2</td></tr><tr class="hl"><td>Mar 26 at 8:26:38 am</td><td>DD-M H:MI:SS</td><td>26-3 8:26:38</td><td>2638-2638</td><td class="pat1">Repeats 4 x 2</td></tr><tr class="hl"><td>Mar 26 at 9:26:39 am</td><td>DD-M H:MI:SS</td><td>26-3 9:26:39</td><td>2639-2639</td><td class="pat1">Repeats 4 x 2</td></tr><tr><td>Mar 26, 2021 at 11:26:23 am</td><td>M-DD-YY HH:MI:SS</td><td>3-26-21 11:26:23</td><td>32621-1-12623</td><td class="pat2">Palindrome (reverse)</td></tr><tr><td>Mar 26, 2021 at 8:26:23 pm</td><td>M-DD-YYYY HH:MI:SS</td><td>3-26-2021 20:26:23</td><td>326202-1-202623</td><td class="pat2">Palindrome (reverse)</td></tr><tr><td>Mar 26, 2021 at 9:26:23 pm</td><td>M-DD-YY HH:MI:SS</td><td>3-26-21 21:26:23</td><td>32621-2-12623</td><td class="pat2">Palindrome (reverse)</td></tr><tr><td>Mar 26, 2021 at 11:12:02 pm</td><td>YYYY-M-DD HH:MI:SS</td><td>2021-3-26 23:12:02</td><td>202132-6-231202</td><td class="pat2">Palindrome (reverse)</td></tr></tbody></table></div><p>The results table highlights the dates that are most interesting and easiest to read in green. The type of pattern shows whether the date is a reversible date (palindrome) or repeatable date.</p><div class="fixed"><p class="help-link noprint"><a href="/web/20210326211033/https://www.timeanddate.com/date/pattern-help.html"> Need some help?</a></p></div></div></article><aside class="layout-grid__sidebar article__sidebar"><div class="clip-block clip-block--list"><div class="blk-series"><h3 class="blk-series__title clip-block__title"> Special Date Combinations </h3><ol class="blk-series__list"><li class="blk-series__item "><a href="/web/20210326211033/https://www.timeanddate.com/date/palindrome-day.html" class="blk-series__item-link"> Palindrome Day </a></li><li class="blk-series__item "><a href="/web/20210326211033/https://www.timeanddate.com/calendar/823-years.html" class="blk-series__item-link"> The 823 Years Myth </a></li><li class="blk-series__item "><a href="/web/20210326211033/https://www.timeanddate.com/date/12-12-12.html" class="blk-series__item-link"> 12/12/12 </a></li><li class="blk-series__item "><a href="/web/20210326211033/https://www.timeanddate.com/date/11-11.html" class="blk-series__item-link"> 11/11/11 </a></li><li class="blk-series__item "><a href="/web/20210326211033/https://www.timeanddate.com/date/10-10-10.html" class="blk-series__item-link"> 10/10/10 </a></li><li class="blk-series__item active"> Date Pattern Calculator </li></ol><p class="blk-series__footer"><a href="/web/20210326211033/https://www.timeanddate.com/date/special-dates.html" class="read-more"> Special Calendar Dates </a></p></div></div><div class="clip-block clip-block--tool"><h3 class="clip-block__title"><a href="/web/20210326211033/https://www.timeanddate.com/calendar/weekdays.html">Find Next Occurrence Of...</a></h3><form method="get" action="/web/20210326211033/https://www.timeanddate.com/scripts/goweekdays.php"><select id="weekd" name="weekd" class="four"><option value="7">Sunday</option><option value="1">Monday</option><option value="2">Tuesday</option><option value="3">Wednesday</option><option value="4">Thursday</option><option value="5" selected>Friday</option><option value="6">Saturday</option></select>   <select id="day" name="day" class="three"><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" selected>13</option><option value="14">14</option><option value="15">15</option><option value="16">16</option><option value="17">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>   <input type="submit" value="Go" class="three"></form></div><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="/web/20210326211033/https://www.timeanddate.com/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="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="2021"></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" selected>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" selected>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 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