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Not much calculation needed:
In general, every year divisible by 4 is a leap year.
Exceptions:
If the year is divisible by 100 then it's NOT a leap year.
Exception to the Exceptions:
If the year is divisible by 400, then it IS a leap year.
So 1980 is a leap year (divisible by 4).
2000 is a leap year (divisible by 400).
1900, 1800, 1700 are not leap years (divisible by 100, but not 400).
Thus endeth the lesson.
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