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Date Pattern Calculator

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.

Click on Advanced options to select a different pattern type, change the date order, include the time, and more.

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196 patterns found for year 2013

Click on any row to see an animation of the date pattern.

Readable DateOrder of DateGrouped as DateGrouped as PatternType
Jan 1 at 12:10:10 amMM-DD HH:MI:SS01-01 00:10:1001010-01010Repeats 5 x 2
Jan 1 at 1:01 amMM-DD HH:MI01-01 01:0101-01-01-01Repeats 2 x 4
Jan 1 at 1:01:01 amMM-DD HH:MI:SS01-01 01:01:0101-01-01-01-01Repeats 2 x 5
Jan 1 at 1:11 amM-D H:MI1-1 1:111-1-1-1-1Repeats 1 x 5
Jan 1 at 1:11:11 amM-D H:MI:SS1-1 1:11:111-1-1-1-1-1-1Repeats 1 x 7
Jan 1 at 11 amM-D HH1-1 111-1-1-1Repeats 1 x 4
Jan 1 at 11:11 amM-D HH:MI1-1 11:111-1-1-1-1-1Repeats 1 x 6
Jan 1 at 11:11:11 amM-D HH:MI:SS1-1 11:11:111-1-1-1-1-1-1-1Repeats 1 x 8
Jan 1M-D1-11-1Repeats 1 x 2
Jan 1MM-DD01-0101-01Repeats 2 x 2
Jan 2 at 12:12:12 pmM-D HH:MI:SS1-2 12:12:1212-12-12-12Repeats 2 x 4
Jan 3, 2013 at 11:31:31 amM-D-YY HH:MI:SS1-3-13 11:31:3113131-13131Repeats 5 x 2
Jan 3, 2013 at 1:13 pmM-D-YY HH:MI1-3-13 13:1313-13-13-13Repeats 2 x 4
Jan 3, 2013 at 1:13:13 pmM-D-YY HH:MI:SS1-3-13 13:13:1313-13-13-13-13Repeats 2 x 5
Jan 3 at 1:13:13 pmM-D HH:MI:SS1-3 13:13:1313-13-13-13Repeats 2 x 4
Jan 3, 2013 at 8:13:20 pmM-D-YYYY HH:MI:SS1-3-2013 20:13:201320-1320-1320Repeats 4 x 3
Jan 3, 2013M-D-YY1-3-1313-13Repeats 2 x 2
Jan 4 at 2:14:14 pmM-D HH:MI:SS1-4 14:14:1414-14-14-14Repeats 2 x 4
Jan 5 at 3:15:15 pmM-D HH:MI:SS1-5 15:15:1515-15-15-15Repeats 2 x 4
Jan 6 at 4:16:16 pmM-D HH:MI:SS1-6 16:16:1616-16-16-16Repeats 2 x 4
Jan 7 at 5:17:17 pmM-D HH:MI:SS1-7 17:17:1717-17-17-17Repeats 2 x 4
Jan 8 at 6:18:18 pmM-D HH:MI:SS1-8 18:18:1818-18-18-18Repeats 2 x 4
Jan 9 at 7:19:19 pmM-D HH:MI:SS1-9 19:19:1919-19-19-19Repeats 2 x 4
Jan 10MM-DD01-1001-10Palindrome (reverse)
Jan 11 at 12:11:10 amMM-DD HH:MI:SS01-11 00:11:1001110-01110Repeats 5 x 2
Jan 11 at 1 amM-DD H1-11 11-1-1-1Repeats 1 x 4
Jan 11 at 1:11 amM-DD H:MI1-11 1:111-1-1-1-1-1Repeats 1 x 6
Jan 11 at 1:11:11 amM-DD H:MI:SS1-11 1:11:111-1-1-1-1-1-1-1Repeats 1 x 8
Jan 11 at 11:11 amM-DD HH:MI1-11 11:111-1-1-1-1-1-1Repeats 1 x 7
Jan 11 at 11 amM-DD HH1-11 111-1-1-1-1Repeats 1 x 5
Jan 11 at 11:11:11 amM-DD HH:MI:SS1-11 11:11:111-1-1-1-1-1-1-1-1Repeats 1 x 9
Jan 11M-DD1-111-1-1Repeats 1 x 3
Jan 11M-DD1-111-1-1Palindrome (reverse)
Jan 21 at 12:12:10 amMM-DD HH:MI:SS01-21 00:12:1001210-01210Repeats 5 x 2
Jan 21 at 2:12:12 amM-DD H:MI:SS1-21 2:12:1212-12-12-12Repeats 2 x 4
Jan 21M-DD1-211-2-1Palindrome (reverse)
Jan 30, 2013 at 1:30:13 amMM-DD-YY HH:MI:SS01-30-13 01:30:13013-013-013-013Repeats 3 x 4
Jan 30, 2013MM-DD-YY01-30-13013-013Repeats 3 x 2
Jan 31 at 12:13:10 amMM-DD HH:MI:SS01-31 00:13:1001310-01310Repeats 5 x 2
Jan 31 at 3:13:13 amM-DD H:MI:SS1-31 3:13:1313-13-13-13Repeats 2 x 4
Jan 31M-DD1-311-3-1Palindrome (reverse)
Feb 1 at 9:21:21 pmM-D HH:MI:SS2-1 21:21:2121-21-21-21Repeats 2 x 4
Feb 2 at 12:20:20 amMM-DD HH:MI:SS02-02 00:20:2002020-02020Repeats 5 x 2
Feb 2 at 2:02 amMM-DD HH:MI02-02 02:0202-02-02-02Repeats 2 x 4
Feb 2 at 2:02:02 amMM-DD HH:MI:SS02-02 02:02:0202-02-02-02-02Repeats 2 x 5
Feb 2 at 2:22 amM-D H:MI2-2 2:222-2-2-2-2Repeats 1 x 5
Feb 2 at 2:22:22 amM-D H:MI:SS2-2 2:22:222-2-2-2-2-2-2Repeats 1 x 7
Feb 2 at 10:22 pmM-D HH:MI2-2 22:222-2-2-2-2-2Repeats 1 x 6
Feb 2 at 10 pmM-D HH2-2 222-2-2-2Repeats 1 x 4
Feb 2 at 10:22:22 pmM-D HH:MI:SS2-2 22:22:222-2-2-2-2-2-2-2Repeats 1 x 8
Feb 2M-D2-22-2Repeats 1 x 2
Feb 2MM-DD02-0202-02Repeats 2 x 2
Feb 3, 2013 at 10:31:32 pmM-D-YY HH:MI:SS2-3-13 22:31:3223132-23132Repeats 5 x 2
Feb 3 at 11:23:23 pmM-D HH:MI:SS2-3 23:23:2323-23-23-23Repeats 2 x 4
Feb 7 at 6:28:18 pmM-D HH:MI:SS2-7 18:28:182.7182818Math constant: e
Feb 12 at 12:21:20 amMM-DD HH:MI:SS02-12 00:21:2002120-02120Repeats 5 x 2
Feb 12 at 1:21:21 amM-DD H:MI:SS2-12 1:21:2121-21-21-21Repeats 2 x 4
Feb 12M-DD2-122-1-2Palindrome (reverse)
Feb 20MM-DD02-2002-20Palindrome (reverse)
Feb 22 at 12:22:20 amMM-DD HH:MI:SS02-22 00:22:2002220-02220Repeats 5 x 2
Feb 22 at 2:22 amM-DD H:MI2-22 2:222-2-2-2-2-2Repeats 1 x 6
Feb 22 at 2 amM-DD H2-22 22-2-2-2Repeats 1 x 4
Feb 22 at 2:22:22 amM-DD H:MI:SS2-22 2:22:222-2-2-2-2-2-2-2Repeats 1 x 8
Feb 22 at 10 pmM-DD HH2-22 222-2-2-2-2Repeats 1 x 5
Feb 22 at 10:22 pmM-DD HH:MI2-22 22:222-2-2-2-2-2-2Repeats 1 x 7
Feb 22 at 10:22:22 pmM-DD HH:MI:SS2-22 22:22:222-2-2-2-2-2-2-2-2Repeats 1 x 9
Feb 22M-DD2-222-2-2Repeats 1 x 3
Feb 22M-DD2-222-2-2Palindrome (reverse)
Mar 1, 2013M-D-YY3-1-1331-13Palindrome (reverse)
Mar 3 at 12:30:30 amMM-DD HH:MI:SS03-03 00:30:3003030-03030Repeats 5 x 2
Mar 3 at 3:03 amMM-DD HH:MI03-03 03:0303-03-03-03Repeats 2 x 4
Mar 3 at 3:03:03 amMM-DD HH:MI:SS03-03 03:03:0303-03-03-03-03Repeats 2 x 5
Mar 3 at 3:33 amM-D H:MI3-3 3:333-3-3-3-3Repeats 1 x 5
Mar 3 at 3:33:33 amM-D H:MI:SS3-3 3:33:333-3-3-3-3-3-3Repeats 1 x 7
Mar 3M-D3-33-3Repeats 1 x 2
Mar 3MM-DD03-0303-03Repeats 2 x 2
Mar 10, 2013 at 3:10:13 amM-DD-YY H:MI:SS3-10-13 3:10:1331013-31013Repeats 5 x 2
Mar 10, 2013M-DD-YY3-10-1331-0-13Palindrome (reverse)
Mar 10, 2013M-DD-YYYY3-10-2013310-2-013Palindrome (reverse)
Mar 11, 2013 at 3:11:13 amM-DD-YY H:MI:SS3-11-13 3:11:1331113-31113Repeats 5 x 2
Mar 11, 2013M-DD-YY3-11-1331-1-13Palindrome (reverse)
Mar 12, 2013 at 3:12:13 amM-DD-YY H:MI:SS3-12-13 3:12:1331213-31213Repeats 5 x 2
Mar 12, 2013M-DD-YY3-12-1331-2-13Palindrome (reverse)
Mar 13 at 12:31:30 amMM-DD HH:MI:SS03-13 00:31:3003130-03130Repeats 5 x 2
Mar 13, 2013 at 1:31 amM-DD-YY H:MI3-13-13 1:3131-31-31-31Repeats 2 x 4
Mar 13, 2013 at 1:31:31 amM-DD-YY H:MI:SS3-13-13 1:31:3131-31-31-31-31Repeats 2 x 5
Mar 13 at 1:31:31 amM-DD H:MI:SS3-13 1:31:3131-31-31-31Repeats 2 x 4
Mar 13, 2013 at 3:13:13 amM-DD-YY H:MI:SS3-13-13 3:13:1331313-31313Repeats 5 x 2
Mar 13, 2013M-DD-YY3-13-1331-3-13Palindrome (reverse)
Mar 13M-DD3-133-1-3Palindrome (reverse)
Mar 14, 2013 at 3:14:13 amM-DD-YY H:MI:SS3-14-13 3:14:1331413-31413Repeats 5 x 2
Mar 14M-DD3-143.14Math constant: pi
Mar 14, 2013M-DD-YY3-14-1331-4-13Palindrome (reverse)
Mar 15, 2013 at 3:15:13 amM-DD-YY H:MI:SS3-15-13 3:15:1331513-31513Repeats 5 x 2
Mar 15, 2013M-DD-YY3-15-1331-5-13Palindrome (reverse)
Mar 16, 2013 at 3:16:13 amM-DD-YY H:MI:SS3-16-13 3:16:1331613-31613Repeats 5 x 2
Mar 16, 2013M-DD-YY3-16-1331-6-13Palindrome (reverse)
Mar 17, 2013 at 3:17:13 amM-DD-YY H:MI:SS3-17-13 3:17:1331713-31713Repeats 5 x 2
Mar 17, 2013M-DD-YY3-17-1331-7-13Palindrome (reverse)
Mar 18, 2013 at 3:18:13 amM-DD-YY H:MI:SS3-18-13 3:18:1331813-31813Repeats 5 x 2
Mar 18, 2013M-DD-YY3-18-1331-8-13Palindrome (reverse)
Mar 19, 2013 at 3:19:13 amM-DD-YY H:MI:SS3-19-13 3:19:1331913-31913Repeats 5 x 2
Mar 19, 2013M-DD-YY3-19-1331-9-13Palindrome (reverse)
Mar 23 at 12:32:30 amMM-DD HH:MI:SS03-23 00:32:3003230-03230Repeats 5 x 2
Mar 23 at 2:32:32 amM-DD H:MI:SS3-23 2:32:3232-32-32-32Repeats 2 x 4
Mar 23M-DD3-233-2-3Palindrome (reverse)
Mar 30MM-DD03-3003-30Palindrome (reverse)
Apr 4 at 12:40:40 amMM-DD HH:MI:SS04-04 00:40:4004040-04040Repeats 5 x 2
Apr 4 at 4:04 amMM-DD HH:MI04-04 04:0404-04-04-04Repeats 2 x 4
Apr 4 at 4:04:04 amMM-DD HH:MI:SS04-04 04:04:0404-04-04-04-04Repeats 2 x 5
Apr 4 at 4:44 amM-D H:MI4-4 4:444-4-4-4-4Repeats 1 x 5
Apr 4 at 4:44:44 amM-D H:MI:SS4-4 4:44:444-4-4-4-4-4-4Repeats 1 x 7
Apr 4M-D4-44-4Repeats 1 x 2
Apr 4MM-DD04-0404-04Repeats 2 x 2
Apr 14 at 12:41:40 amMM-DD HH:MI:SS04-14 00:41:4004140-04140Repeats 5 x 2
Apr 14 at 1:41:41 amM-DD H:MI:SS4-14 1:41:4141-41-41-41Repeats 2 x 4
Apr 14M-DD4-144-1-4Palindrome (reverse)
Apr 24 at 12:42:40 amMM-DD HH:MI:SS04-24 00:42:4004240-04240Repeats 5 x 2
Apr 24 at 2:42:42 amM-DD H:MI:SS4-24 2:42:4242-42-42-42Repeats 2 x 4
Apr 24M-DD4-244-2-4Palindrome (reverse)
May 5 at 12:50:50 amMM-DD HH:MI:SS05-05 00:50:5005050-05050Repeats 5 x 2
May 5 at 5:05 amMM-DD HH:MI05-05 05:0505-05-05-05Repeats 2 x 4
May 5 at 5:05:05 amMM-DD HH:MI:SS05-05 05:05:0505-05-05-05-05Repeats 2 x 5
May 5 at 5:55 amM-D H:MI5-5 5:555-5-5-5-5Repeats 1 x 5
May 5 at 5:55:55 amM-D H:MI:SS5-5 5:55:555-5-5-5-5-5-5Repeats 1 x 7
May 5M-D5-55-5Repeats 1 x 2
May 5MM-DD05-0505-05Repeats 2 x 2
May 15 at 12:51:50 amMM-DD HH:MI:SS05-15 00:51:5005150-05150Repeats 5 x 2
May 15 at 1:51:51 amM-DD H:MI:SS5-15 1:51:5151-51-51-51Repeats 2 x 4
May 15M-DD5-155-1-5Palindrome (reverse)
May 25 at 12:52:50 amMM-DD HH:MI:SS05-25 00:52:5005250-05250Repeats 5 x 2
May 25 at 2:52:52 amM-DD H:MI:SS5-25 2:52:5252-52-52-52Repeats 2 x 4
May 25M-DD5-255-2-5Palindrome (reverse)
Jun 6 at 6:06 amMM-DD HH:MI06-06 06:0606-06-06-06Repeats 2 x 4
Jun 6 at 6:06:06 amMM-DD HH:MI:SS06-06 06:06:0606-06-06-06-06Repeats 2 x 5
Jun 6M-D6-66-6Repeats 1 x 2
Jun 6MM-DD06-0606-06Repeats 2 x 2
Jun 16M-DD6-166-1-6Palindrome (reverse)
Jun 26M-DD6-266-2-6Palindrome (reverse)
Jul 7 at 1:06 amMM-DD H:MI07-07 1:060.707106Math: Inv Sq Root of 2
Jul 7 at 7:07 amMM-DD HH:MI07-07 07:0707-07-07-07Repeats 2 x 4
Jul 7 at 7:07:07 amMM-DD HH:MI:SS07-07 07:07:0707-07-07-07-07Repeats 2 x 5
Jul 7M-D7-77-7Repeats 1 x 2
Jul 7MM-DD07-0707-07Repeats 2 x 2
Jul 7MM-DD07-070.707Math: Inv Sq Root of 2
Jul 17M-DD7-177-1-7Palindrome (reverse)
Jul 27M-DD7-277-2-7Palindrome (reverse)
Aug 8 at 8:08 amMM-DD HH:MI08-08 08:0808-08-08-08Repeats 2 x 4
Aug 8 at 8:08:08 amMM-DD HH:MI:SS08-08 08:08:0808-08-08-08-08Repeats 2 x 5
Aug 8M-D8-88-8Repeats 1 x 2
Aug 8MM-DD08-0808-08Repeats 2 x 2
Aug 18M-DD8-188-1-8Palindrome (reverse)
Aug 28M-DD8-288-2-8Palindrome (reverse)
Sep 9 at 9:09 amMM-DD HH:MI09-09 09:0909-09-09-09Repeats 2 x 4
Sep 9 at 9:09:09 amMM-DD HH:MI:SS09-09 09:09:0909-09-09-09-09Repeats 2 x 5
Sep 9M-D9-99-9Repeats 1 x 2
Sep 9MM-DD09-0909-09Repeats 2 x 2
Sep 19M-DD9-199-1-9Palindrome (reverse)
Sep 29M-DD9-299-2-9Palindrome (reverse)
Oct 1 at 12:10:10 amMM-D H:MI:SS10-1 0:10:1010-10-10-10Repeats 2 x 4
Oct 1MM-D10-11-0-1Palindrome (reverse)
Oct 1MM-DD10-0110-01Palindrome (reverse)
Oct 10 at 10:10 amMM-DD HH:MI10-10 10:1010-10-10-10Repeats 2 x 4
Oct 10 at 10:10:10 amMM-DD HH:MI:SS10-10 10:10:1010-10-10-10-10Repeats 2 x 5
Oct 10 at 11:01:01 amMM-DD HH:MI:SS10-10 11:01:0110101-10101Repeats 5 x 2
Oct 10MM-DD10-1010-10Repeats 2 x 2
Oct 20 at 11:02:01 amMM-DD HH:MI:SS10-20 11:02:0110201-10201Repeats 5 x 2
Oct 30 at 11:03:01 amMM-DD HH:MI:SS10-30 11:03:0110301-10301Repeats 5 x 2
Nov 1 at 1 amMM-D H11-1 11-1-1-1Repeats 1 x 4
Nov 1 at 1:11 amMM-D H:MI11-1 1:111-1-1-1-1-1Repeats 1 x 6
Nov 1 at 1:11:11 amMM-D H:MI:SS11-1 1:11:111-1-1-1-1-1-1-1Repeats 1 x 8
Nov 1 at 11:10:11 amMM-DD HH:MI:SS11-01 11:10:1111011-11011Repeats 5 x 2
Nov 1 at 11 amMM-D HH11-1 111-1-1-1-1Repeats 1 x 5
Nov 1 at 11:11 amMM-D HH:MI11-1 11:111-1-1-1-1-1-1Repeats 1 x 7
Nov 1 at 11:11:11 amMM-D HH:MI:SS11-1 11:11:111-1-1-1-1-1-1-1-1Repeats 1 x 9
Nov 1MM-D11-11-1-1Palindrome (reverse)
Nov 1MM-D11-11-1-1Repeats 1 x 3
Nov 11 at 1:11 amMM-DD H:MI11-11 1:111-1-1-1-1-1-1Repeats 1 x 7
Nov 11 at 1 amMM-DD H11-11 11-1-1-1-1Repeats 1 x 5
Nov 11 at 1:11:11 amMM-DD H:MI:SS11-11 1:11:111-1-1-1-1-1-1-1-1Repeats 1 x 9
Nov 11 at 11:11 amMM-DD HH:MI11-11 11:111-1-1-1-1-1-1-1Repeats 1 x 8
Nov 11 at 11 amMM-DD HH11-11 111-1-1-1-1-1Repeats 1 x 6
Nov 11 at 11:11:11 amMM-DD HH:MI:SS11-11 11:11:111-1-1-1-1-1-1-1-1-1Repeats 1 x 10
Nov 11MM-DD11-111-1-1-1Repeats 1 x 4
Nov 11MM-DD11-1111-11Palindrome (reverse)
Nov 12, 2013MM-DD-YY11-12-1311-12-13Increasing numbers
Nov 21 at 11:12:11 amMM-DD HH:MI:SS11-21 11:12:1111211-11211Repeats 5 x 2
Dec 1 at 2:12:12 amMM-D H:MI:SS12-1 2:12:1212-12-12-12Repeats 2 x 4
Dec 1MM-D12-11-2-1Palindrome (reverse)
Dec 2 at 11:20:21 amMM-DD HH:MI:SS12-02 11:20:2112021-12021Repeats 5 x 2
Dec 12 at 11:21:21 amMM-DD HH:MI:SS12-12 11:21:2112121-12121Repeats 5 x 2
Dec 12 at 12:12 pmMM-DD HH:MI12-12 12:1212-12-12-12Repeats 2 x 4
Dec 12 at 12:12:12 pmMM-DD HH:MI:SS12-12 12:12:1212-12-12-12-12Repeats 2 x 5
Dec 12MM-DD12-1212-12Repeats 2 x 2
Dec 21MM-DD12-2112-21Palindrome (reverse)
Dec 22 at 11:22:21 amMM-DD HH:MI:SS12-22 11:22:2112221-12221Repeats 5 x 2

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.

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