Quote:
Originally Posted by billdan
I must admit I didn't until it was pointed out to me by the BBC.
Yesterday Sun 02 Feb 2020 is a unique palindrome 02-02-2020. Its unique because it doesn't matter whether you use dd-mm-yyyy or mm-dd-yyyy.
According to the BBC the last time it happened was 11-11-1111.
The next one will be 12-12-2121.
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That 1111 date has to have at least one more level of uniqueness which did not reoccur yesterday.