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). If a year is divisible by 100 but not 400, it is a common year (not a leap year). For example, the years 1600 and 2000 were century leap years; the century years 1700, 1800, and 1900 were common years, as will be for 2100, 2200, and 2300. 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. 