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This article is from the Calendars FAQ, by Claus Tondering claus@tondering.dk with numerous contributions by others.

2.2.1. What years are leap years? (Gregorian calendar)

The Gregorian calendar has 97 leap years every 400 years:

Every year divisible by 4 is a leap year.
However, every year divisible by 100 is not a leap year.
However, every year divisible by 400 is a leap year after all.

So, 1700, 1800, 1900, 2100, and 2200 are not leap years. But 1600,
2000, and 2400 are leap years.

(Destruction of a myth: There are no double leap years, i.e. no years
with 367 days. See, however, the note on Sweden in section 2.2.4.)

 

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