Sunday 2 March 2008

Leap day rules. obey them.

Why We Have Leap Days

Summary:
What to do to figure out if it’s a leap year or not:
We add a leap day every 4 years, except for every 100 years, except for every 400 years. In other words…

If the year is divisible by 4, then it’s a leap year, UNLESS
it’s also divisible by 100, then it’s not a leap year, UNLESS FURTHER
the year is divisible by 400, then it is a leap year.

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