Brooke Clarke wrote:

> I almost have it working and found a problem while testing.  Here are 
> some test dates and the results:
> 28 Feb 1992 Sat - 0 works
> 29 Feb 1992 Sun - 1 works
> 28 Feb 2000 Mon - 2 works
> 29 Feb 2000 Tue - 3 works
>  1 Mar 2000 Wed - 4 works
> 28 Feb 2004 Sat - shows Sun 1
> 29 Feb 2004 Sun - shows Mon 2
> 
> When manually calculated as follows 28 Feb 2004 comes out Sunday.  What 
> am I doing wrong?

I'm not sure what your source is for Zeller's Congruence. I found the
Wikipedia article not that clear. Here are a couple other sources, with
better explanations and also reference implementations based on Zeller's
principle:

http://www.merlyn.demon.co.uk/zeller-c.htm#OZC
http://wwwcdf.pd.infn.it/MLO/Calendars/Notes.html#zeller

Gerhard

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist