The Bride and Groom, dog wedding. Sequential dates, such as 11/12/13, have been called the “perfect” date to get married. For math or number lovers, a couple could try to time their increasing number wedding ceremony for 11/12/13 at 14:15:16 seconds. Photo #1 by geckoam

Cat with bride. 10/11/12 was another pleasing and popular date for weddings, but sequential dates are not as popular for tying the knot as repeating dates like 10/10/10, 11/11/11 or 12/12/12. Photo #2 by Ivan Malafeyev

Here comes the bride. Now imagine the 2012 date repeating 6 times by adding hours, minutes and seconds, 12/12/12 at 12:12:12. But 12/12/12, for example, was also special for being a palindrome date, meaning it’s the same date when reversed. Photo #3 by Nathan Rupert

Here comes the groom. Apparently couples are crazy about special number dates. For example, Brian Beitler, chief marketing officer for David’s Bridal, said, “Iconic dates have become a trend in the U.S., reaching new heights when over 65,000 couples tied the knot on 07/07/07.” Photo #4 by Nathan Rupert

Blushing Bride. While the date Nov. 2, 2011, written out numerically as 11/02/2011 might not have seemed as special, it was in fact so exceedingly rare that it happens once every 10,000 years. That’s because it’s a “very rare eight-digit palindrome date, meaning that it can be read the same way frontward and backward.” Aziz Inan, a professor of electrical engineering at the University of Portland, explained, “Eight-digit palindrome dates are very rare, and are clustered in the first three or so centuries at the beginning of a millennial, and then don’t show up for 600 to 700 years, until they appear as a cluster in the next millennium.” Photo #5 by Cynr

A Nervous Groom. December, 12, 2012 or 12-12-12 was “the last date of its kind – when all three numericals in a date are the same – for the next 88 years. The next time this will happen is on January 1, 2101, or 01-01-01.” We are as unlikely to see that date as we are to see the 36th and last palindrome date of this millennium that will occur on Sept. 22, 2290. The next one after that will be Oct. 3, 3001. Photo #6 by Steve Jurvetson

Bride & her Beagle. But hey, if you really want to be married on a palindrome date, then all you have to do is wait 7 years and travel to a different country. Not Belize that uses the same calendar format as the U.S., but most of the world uses the date format of day/month/year. Future palindrome dates in the format DD-MM-YYYY include February 2, 2020; February 12, 2021; February 22, 2022; February 3, 2030. Photo #7 by Andrea Janda

Bride and groom dogs. Besides sequential patterns like 11/12/13, or palindrome dates like 11/11/11, there are also repeating sequences. In fact, there are a plethora of patterned dates in the 21st century. Photo #8 by Pets Advisor

Miss Gigi-The Bride. Less rare, but far from common, are 7-digit palindrome dates; there are 26 such dates within this century. Photo #9 by Cynr

Modern bride. There are digital mirror dates, “which read the same in the mirror. These are rather rare, because they can only make use of the digits 0, 2, 5, and 8.” Examples of such month/day/year future dates include May 5, 2020 (05/05/2020 or 2020-05-05), February 5, 2050 (02/05/2050 or 2050-05-02), August 5, 2080 (08/05/2080 or 2080-08-05). Photo #10 by istolethetv

Left: French bulldog in wedding. Right: The guard of the wedding dress. For most other countries that use day/month/year, digital mirror dates examples include May 5, 2020 (05-05-2020), May 25, 2025 (25-05-2025), and May 20, 2005 (20-05-2005) — but the latter is also a “double date.” A month/day/year double date example is December 31, 1231 (12/31/1231 or 1231.12.31). Photo #11 by diegofornero & #12 by Marcos de Madariaga

Cat and the wedding bouquet. Double dates, in the format of day/month/year, “always appear in the first 12 years of the century. There are a total of 257 of these day with the first being January 1, 1001 and the last being December 31, 3112.” Photo #13 by Sha Sha Chu

Royal wedding, in congratulations to William and Kate. Psychologist Dr Seema Hingorrany says some couples regard dates like 11/12/13 as lucky, or easy to remember for anniversaries. “Couples who are romantic would like to choose this date as it would be something unusual.” Dr Hingorrany added that “while getting married on a special date is something that has you excited, don’t rush to choose a day without the right reasons. While being spontaneous is good, don’t opt for something just to show off. A lucky date does not necessarily mean your marriage will be a fairy-tale one.” Photo #14 by Geckoam

Canine wedding. There are also square root dates like January 1, 2001 (01-01-01), February 2, 2004 (02-02-04), March 3, 2009 (03-03-09), April 4, 2016 (04-04-16) and May 5, 2025 (05-05-25). Another fun/odd fact: China does dates a bit differently in the format of year/month/day. Photo #15 by Adam Sowers

Now for a break and back to pets in weddings: “Then out of nowhere came this huge dog.” The photographer added, “Seriously. I was photographing the groomsmen for this wedding and this huge dog came running up out of nowhere and ran right up to the groom. The dog then proceeded to slobber all over the groom and the guy on the right, it was hilarious.” Photo #16 by Daniel Hoherd

Bride and groom, Fritz and Frieda, the happy couple. Not only is today, 11/12/13, a consecutive numbers date, after today the only other sequential date this century falls on 12/13/14. There won’t be another one until Jan. 2, 2103, or 1/2/03 Photo #17 by Peter Jackson

Happy couple. But really, if you stop to think about it, “Who gets married on a Tuesday? Nobody — unless the date is 11/12/13.” Photo #18 by istolethetv

Dog bride. David’s Bridal suggests that, nationwide, at least 2,300 couples will marry on 11/12/13. Oddly enough, “that’s about 10 times the number on the same Tuesday last year.” Photo #19 by istolethetv

Sashi the Bride. The absolute last “consecutive series of the century will occur next year, 12/13/14. It falls on a Saturday,” so David’s Bridal said, “We predict this date could reach record breaking numbers.” Photo #20 by Stephan Woods

Jules & Luna bride and groom. If you like numbers, or want to celebrate “Festivals of Numerical Coincidence,” then you might want to check out the date pattern calculator for 2013. Photo #21 by Daniel Cooke

Ring bearer needs a little scratch. So today is a little bit magical and extremely busy for marriages. Photo #22 by Dan Merino

Left: Meeting the dog bride. Right: Dog in wedding. The New York Times has an article archived from December 1, 1851 about curious numerical coincidences, but numerology is way too complex for a photography blog where you come to kick back, relax and look at pets in wedding costumes ;-). Photo #23 by Duncan Robson & #24 by Andrew Malone

Opposites attract. No worries if you miss this special date, 11/12/13, as Festivals of Numerical Coincidence happen more than you might think. The Date Pattern Calendar found 63 patterns for the year 2014. Photo #25 by Martin Ringlein