There have been about 514 Leap Years since Caesar created it in 45BC. Without the extra day every 4 years, today would be July 28, 2013. Also, the Mayan calendar did not account for leap year…so technically the world should have ended 7 months ago.
Guess we are all safe and can all stop worrying about the world coming to end. (If you believed it would)
Just thought I would throw this out there.