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  2. RPG400-L
  3. May 2008

Re: Determine birth date 6s0 format

Florin Todor - YYZ Concord wrote:
Lim, your example is not the best one; if Feb. 29 is valid for specific
year, it is valid for the (year-100); the opposite is, also, true...
I thing there is only one exception to this rule, the year 1900 (which,
if I'm not mistaken, it wasn't a leap year, but 2000 it was...)

I haven't taken the time to prove it, but I think this is true for any year y where y mod 400 = 0, due to:

> if (year modulo 4 is 0) and (year modulo 100 is not 0) or (year modulo > 400 is 0)
>
> then leap
> else no_leap

(from http://en.wikipedia.org/wiki/Leap_year#Algorithm)

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