>Hello All,
>A simple question but one I have gone completelty blank on.
>
>How do I define a leap year?? I know that year % 4 returning a 0 is not enough. What's the rest??
>
>Thanks

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Hi all, after watching each formula to handle leap year, I feel today progr is very lucky.

At 198X, If progr need to build a calendar, it is a huge job to do~~~
Now, just call the Internal Window, ocx to do... ^0^'

Now, in vfp, we have CDOW(), DOW() to return the weekday value.
When I start learn GWBASIC, I only get a mathematical formula to do....

IF MM < 3  && Jan or Feb
  MM = MM + 12
  YYYY = YYYY + 1
ENDIF

N = YYYY + MM + DD + 1 + Int(YYYY/4) - Int(YYYY/100) + Int(YYYY/400) + ;
    + Int((3 * MM + 1)/5)
nWeekDay = MOD(N, 7)

* if nWeekDay is Zero, Mean SunDay and so on...

Using this formula, I have made a Calendar for following Language:
GWBASIC, PASCAL, C, C++

but now, wow...... no need to do much silly thing but use simple function!!

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Wanting to Be a Mathematician...
I can tell you an interest thing on Leap Year!!

at 1752, Sept! There is two times from 3 to 13 !!
Why? Because ppl wonder the different from leap 1/4 year problem is not accuately enough and thus you got the new formula... ~_^

You can simple type: CAL 1752 in UNIX and see what I said here!!

p.s. maybe it is too informatic, but know it just for fun!!
MayBe I interest that the dead date of christ is Friday or NOT! :P