>Jim,
>
>>The rule I know was this;
>>
>>The year must be divisible by 4, except for even centuries which must be divisible by 400.
>
>That would be:
>The year is divisable by 4 except for the century years which are not divisable by 4.
>
>(20 mod 4 = 0) --> leap year
>(19 mod 4 = 3) --> not a leap year
>
>Walter,

You must include the 100 & 400 checks. 2100, 2200, 2300 will NOT be leap years, but 2400 will be.