Welcome to the 11th day of the 12th month of the 13th year of the millennium!

11121311.12.13. This once-in-a-lifetime sequential date has a nice continuous ring about it – the 11th day of the 12th month of the 13th year of the millennium.

It’s a day for celebration, even marriage – at least for people who love numbers – as the calendar rolled over to 11/12/13, or November 12, 2013. The only other sequential date still to come this century – at least in the American-style of putting the month before the day – will be next year, on 12/13/14. After that, it’ll be around another 90 years before the next sequential date, in 2103, with 01/02/03, according to the site numerology.com.

Sequential dates like 9/10/11, 10/11/12, 11/12/13 and palindrome dates such as 12/12/12 have historically been popular for all sorts of occasions including wedding dates. Many number fans are already marking the day by tying the knot, as they see the opportunity to get married on a unique date like this as being “lucky”.

“Happy 11/12/13!” popped up across the internet Tuesday, and on Twitter AsapScience called on people to make a wish at 14:15 (and 16 seconds).

TIME website says 11/12/13 has become more than a cool sequential calendar date; apparently it’s the most romantic day of the year.

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