Every four years, an extra day is added to the calendar, But even with leap day, the math doesn't exactly, well, math.

So, what do you do when your birthday disappears from the calendar? On a non-Leap Year, some leapers choose to celebrate the big day on Feb. 28. Some choose to celebrate on March 1. Some even ...

The emperor Caesar adopted a 365-day calendar and added 10 days to it, including a leap day in February every four years, writes Calendar.com. Eventually, the calendar we all know was adopted by ...

The emperor Caesar adopted a 365-day calendar and added 10 days to it, including a leap day in February every four years, writes Calendar.com. Eventually, the calendar we all know was adopted by ...