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2016-10-06
Thanks to Marc, I noticed that today's date is a palindrome in two different date formats—DMMYY (61016) and DMMYYYY (6102016).
This made me wonder when there will be another date that is palindromic in multiple date formats, so I wrote a Python script to find out.
Turns out there's not too long to wait: 10 July 2017 will be palindromic in two date formats (MDDYY and MDDYYYY). But before that, there's 1 July 2017, which is palindromic in three date formats (YYMMD, YYMD and MDYY). Most exciting of all, however, is 2 February 2020, which is palindromic in 7 different formats!
The next palindromic dates are shown in the following table. It will update as the dates pass.
| \(n\) | Next day with \(\geq n\) palindromic formats | Formats |
| 1 | Today! | MDDYYYY,MDDYY |
| 2 | Today! | MDDYYYY,MDDYY |
| 3 | 12 February 2021 | DDMMYYYY,YYMDD,DDMYY |
| 4 | 2 February 2022 | YYYYMDD,YYMMD,YYMD,DMYY,MDYY |
| 5 | 2 February 2022 | YYYYMDD,YYMMD,YYMD,DMYY,MDYY |
| 6 | 1 January 2211 | YYMMD,DMYYYY,MDYYYY,YYMD,DMYY,MDYY |
A full list of future palindromic dates can be found here.
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