What is a symmetrical date?

Answer 1

A symmetrical date is a day of the year which when written in numerical form shows a symmetry or order. For example Eleventh November Two Thousand and Eleven when written in numerical date format becomes 11-11-11.

Answer 2

Oh, dude, a symmetrical date is when the date reads the same forwards and backwards, like 02/02/2020 or 11/11/1111. It's like a little numerical palindrome party for your calendar. So, if you're into that kind of thing, mark your calendar for the next one and get ready to celebrate... or not, like, whatever.