2nd Century-ending leap year ever!


Under the Gregorian calendar, the last year in a Century (a year divisible by 100) is not a leap year unless it is also divisible by 400. Thus, 1700, 1800, and 1900 were not leap years. The calendar was invented a few years before 1600, so next year will be only the second time in history this aspect of the Gregorian calendar will take effect. Britain and colonies didn’t adopt the Gregorian calendar until the 18th century, so this is the first Century-ending leap year in the United States.

Of course, the “exception to an exception” provisions of Gregor’s calendar will confuse a lot of people, who are sure to insist that 2000 should not be a leap year.

I mean, the first Century-end leap year in the states since the Gregorian calendar was adopted. 1600 would have been a leap year under the Julian calendar.

Also, Unca Cecil mentioned the 4000-year rule, which states that every 4000th year won’t be a leap year. This is a quadruple exception! That is:

A year has 365 days.
Exception 1: years divisible by 4 have 366.
Exception 2: years divisible by 100 have 365.
Exception 3: years divisible by 400 have 366.
Exception 4: [sup]yea[/sup]rs d[sub]ivi[/sub]sible b[sup]y 40[/sup]00 have* 36*5.