In the Gregorian calendar, a Century leap year is a year that is exactly divisible by 400 (and, thus, as with every other leap year, qualifies for the intercalation of February 29). The years 1600 and 2000, for example, were century leap years; the century years of 1700, 1800, and 1900 were not century leap years. The next century leap year will occur in 2400. Century leap years always start on a Saturday, and the February 29 intercalation of such years is always a Tuesday.
The century year "divisible by 400" rule of the Gregorian calendar was considered an improvement over the previously utilized Julian calendar which had provided for a leap year every four years; this practice resulted, over the centuries, in too many leap days being added to the calendar and placing it out of step with the astronomical seasons.
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In the Gregorian calendar, a century leap year is a year that is exactly divisible by 400 (and qualifies for the adding of February 29, like all other leap years). For example, the years 1600 and 2000 are century leap years; the century years 1700, 1800, and 1900 are not century leap years. The next century leap year will occur in the year 2400. Century leap years always begin on a Saturday, and February 29 always falls on a Tuesday.
  | Frequently Asked Questions about Calendars - The Calendar FAQ |
| | History of Gregorian Calendar - History Of Our Calendar | Calendars |
| | An Introduction to Calendars courtesy of the United States Naval Observatory - Introduction to Calendars |
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