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

The modern calendar has Roman Catholic roots. As the sun does not adhere exactly to the earthly calendar, leap days are ...

February gets a leap year once every four years to keep the calendar in sync with Earth's seasons. Leap years account for the inaccurate measure of time on the 365-day calendar. Technically it ...