"1-20-21 begins the first of 10 consecutive palindrome dates (numbers that read the same forward and backward) in the five-digit format," The Farmers' Almanac tweeted. "There will be a TOTAL of 22 palindrome dates in 2021."
Wednesday kicks off 10 palindrome dates in a row. The dates of 1-20-21, 1-21-21, 1-22-21, 1-23-21, 1-24-21, 1-25-21, 1-26-21, 1-27-21, 1-28-21 and 1-29-21 all read the same forward and backward. While these dates are all five-digit palindromes, the month has already seen a four-digit palindrome -- back on Jan. 2, when the date could be written as 1-2-21. You can also write Jan. 20, 2021, as a seven digit palindrome if you write out the entire year, 1-20-2021.
Mirror == looking glass, as in Through The Looking Glass with Alice.