Hmm..
When the date is written 10-8-01, it's symmetric, i.e. a palindrome, reads the same front and back, though it's not all that uncommon. Depending on what format of writing the date you use, it comes up 9 times this year if you use dd/mm/yy, and comes up 9 times if you use mm/dd/yy in October.
Though that may not be it. Or you can also say the date is symmetric on a line drawn horizontally through the middle of it.
KF