Both the Gregorian and the Julian calendars have a leap year with an extra day added every four years. However, because the Julian calendar’s seasonal dates regress by nearly one day per century, the Gregorian calendar compensates by not allowing century years to be leap years unless they are divisible by 400. That is, 1800 and 1900 were not leap years. The year 2000 was a leap year, but 2100 will not be.
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