RE: the seed date behind the curtain--RE: Can I get the Day of th e we ek?

That's been known to happen from time to time.

> -----Original Message-----
> From: Wills, Mike N. (TC) [mailto:MNWills@Taylorcorp.com]
> Sent: Wednesday, May 16, 2001 12:18 PM
> To: 'RPG400-L@midrange.com'
> Subject: RE: the seed date behind the curtain--RE: Can I get 
> the Day of
> th e we ek?
> 
> 
> ...then my instructor was wrong...
> 
> -----Original Message-----
> From: Joel Fritz [mailto:JFritz@sharperimage.com]
> Sent: Wednesday, May 16, 2001 11:28 AM
> To: 'RPG400-L@midrange.com'
> Subject: the seed date behind the curtain--RE: Can I get the 
> Day of the
> we ek?
> 
> 
> The following link describes Zeller's Congruence--the formula 
> below--which
> uses the date England adopted the Gregorian calendar as its seed.  The
> sample problem on the web page assumes that the college is solvent.   
> 
> http://www.cs.unt.edu/~acm/hspc/samples/beg-P1.html
> 
> 
> 
> > -----Original Message-----
> > From: Wills, Mike N. (TC) [mailto:MNWills@taylorcorp.com]
> > Sent: Wednesday, May 16, 2001 7:41 AM
> > To: 'RPG400-L@midrange.com'
> > Subject: RE: Can I get the Day of the week?
> > 
> > 
> > There is a mathematical formula for getting the day of the week:
> > 
> > D = Day
> > M = Month
> > Y = the last two digits of the year
> > C = Century
> > 
> > ((d + y) - (2 * c) + (y / 4) + (c / 4) + ((13 * m - 1) / 
> 5)) % 7 = Day
> > 
> > For the Day: 0 = Sunday, 1 = Monday, etc.
> > For some reason my program is a day off right now but I am 
> > positive I had it
> > working before. I haven't taken the time to debug it yet. 
> > This was done in
> > C++ on a PC. I need to double check my formula.
> > 
> > But with this formula it doesn't depend on a known date. I 
> > don't know if it
> > could cause problems, I just remember people keep on saying 
> > to NOT hard-code
> > anything in if possible (although I am sure many of us do 
> > anyway). This is a
> > formula that my instructor gave me and I have seen it on the 
> > web. Then, if
> > you (for some weird reason) need a day from the 1600's you 
> > can get it. 
> > 
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