Leap Year Calculator
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Leap Year Rules
Divisible by 4
A year must be divisible by 4 to be a leap year.
Century Years
Century years must be divisible by 400.
A year must be divisible by 4 to be a leap year.
Century years must be divisible by 400.
A leap year is a year containing one additional day (February 29) to keep the calendar year synchronized with the astronomical year. This happens approximately every four years to account for the fact that a complete revolution around the Sun takes approximately 365.25 days.