[snip]
>            Now I'm no mathematician but I can't think of a year (at least
> in the future) that's divisible by 400 and not divisible by 4, so can we do
> away with the first rule ("divisible by 400")? That would leave "evenly
> divisible by 4 AND not evenly divisible by 100". The next such year is 2100
[snip]
> Costas
>
Nope!! All years that end in 00 are divisible by 4. You've got to knock
out 2100, 2200, 2300 and leave 2000, 2400, .... So the "divisible by 400"
and "not evenly divisible by 100" are both necessary.

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