Century leap year

A century leap year is a leap year in the Gregorian calendar that is evenly divisible by 400. This means that the other three century years are not leap years, making them an exception to the usual rule that a leap year is one that is evenly divisible by four. (The Julian calendar does not have this exception.) More specifically, the years 1600 and 2000 were century leap years while (where the Gregorian rule was observed) 1700, 1800 and 1900 were century common years.

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