They are not universally palindromic.
For example, 2030-03-02 (yyyy-mm-dd) when written as 02-03-2030 (dd-mm-yyyy) is not a palindrome.
All dates in the list I have provided are universally palandromic, i.e., they are palindromes irrespective of the endianness (big, little, or middle) used to represent them.
> 20300302, 20400402, etc
https://news.ycombinator.com/item?id=22214936