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A date data-type (which is what I am assuming you are using) is aware of leap years. That is why date data-types or better for dates than just 8.0 numeric.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Schutte, Michael D
Sent: Wednesday, August 10, 2011 11:53 AM
To: RPG programming on the IBM i / System i
Subject: Subtracting 364 days from current date.

http://code.midrange.com/d6c4354ba1.html


I put a sample program at the link above. I was wondering if anyone could explain the situation to me? If you take today's date and subtract 364 days, you get a Wednesday of last year. That's great, that's what I want, however, you take 08/13/2008 and subtract 364 days you still get a Wednesday, 8/15/2011. My question is how is that possible when 2008 was a leap year and there's an extra day Febraury 29th, 2008.

Excel comes up with the same results. Don't get me wrong, I do want that Wednesday, I'd just like to know how it's working... I'm not seeing it.

Here's what excel came up with (same as what I get with RPGLE).
Wednesday, August 10, 2011

Wednesday, August 11, 2010

Subtract 364 From Previous

Wednesday, August 12, 2009

Subtract 364 From Previous

Wednesday, August 13, 2008

Subtract 364 From Previous

Wednesday, August 15, 2007

Subtract 364 From Previous

Wednesday, August 16, 2006

Subtract 364 From Previous

Wednesday, August 17, 2005

Subtract 364 From Previous

Wednesday, August 18, 2004

Subtract 364 From Previous

Wednesday, August 20, 2003

Subtract 364 From Previous

Wednesday, August 21, 2002

Subtract 364 From Previous

Wednesday, August 22, 2001

Subtract 364 From Previous

Wednesday, August 23, 2000

Subtract 364 From Previous

Wednesday, August 25, 1999

Subtract 364 From Previous

Wednesday, August 26, 1998

Subtract 364 From Previous

Wednesday, August 27, 1997

Subtract 364 From Previous

Wednesday, August 28, 1996

Subtract 364 From Previous

Wednesday, August 30, 1995

Subtract 364 From Previous


Thank you,



Michael Schutte
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