Similar to Odd Day is Square Root Day, where the month and day are the square roots of the year.  This happens nine times each century:  01/01/01, 02/02/04, 03/03/09, 04/04/16, 05/05/25, 06/06/36, 07/07/49, 08/08/64, and 09/09/81.  No, today isn't a Square Root Day, but today was the first I heard of it.  Being the nerd that I am, I had to post this. #math