It's a Palindrome day.

What’s a Palindrome Day?
A Palindrome Day occurs when the digits in a day’s date can be read the same way backward and forward. Depending on the date format or order Palindrome Days can be rare.

Still doing the math on the "only such date this century", but this seems legit. ;)

OK, it seems that it checks out.

Sunday’s date is a rare palindrome that hasn’t happened in over 900 years
The date will be a palindrome for nine straight days during May 2015. Gillian Pensavalle (@GillianWithaG) explains. Buzz60

Happy Palindrome Day.

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