Time scales and civil time

Leap year

Also: schrikkeljaar

A solar year lasts about 365.2422 days. To absorb that difference the Gregorian calendar adds a leap day every four years, with one exception: century years are only a leap year if divisible by 400 (2000 was, 1900 and 2100 are not).

This keeps the calendar aligned with the seasons over the centuries.

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