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  2. RPG400-L
  3. May 2007

Re: Months are weird, was '3 Months Ago?'

What bothers me is that dates don't round trip well. Does March 31st
less one month, plus one month, equal March 31st?

If you need real exact, you could always take an approach of:

/free
Select;
When (Month = 'JAN') And (Func = 'Sub');
Daycnt = 92; //dec =31 + Nov = 30 + Oct =31
When (Month = 'JAN') And (Func = 'Add') and (not leapyear);
Daycnt = 90; //(Jan = 31 + Feb = 28 + Mar = 31)
When (Month = 'JAN') And (Func = 'Add') and (leapyear);
Daycnt = 91; //(Jan = 31 + Feb = 29 + Mar = 31)
When (Month = 'FEB') And (Func = 'Sub');
Daycnt = 92; //dec =31 + Nov = 30 + Jan =31
When (Month = 'FEB') And (Func = 'Add') and (not leapyear);
Daycnt = 89; //(Apr = 30 + Feb = 28 + Mar = 31)
When (Month = 'FEB') And (Func = 'Add') and (leapyear);
Daycnt = 90; //(Feb = 29 + Mar = 31 + Apr 30 )
//etc.
EndSL

This could also be done with a compile time table-but the logic wouldn't
have as clear.
- Jim









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