George Washington's B-Day is the Third Monday of February, 1732

George Washington didn't even have a birthday, but rather God granted him the ability to be born on the third monday of the month of February, and that is why we celebrate President's day not on a certain "date," because that "date" has nothing to do with George Washington... he is a transient being capable of being born whenever he damn well chooses to as long as it falls on the third Monday of the month of February.

Other people who have the same birthday rule: MLK Jr., Abraham Lincoln and Thanksgiving.