From: Rick Maffei <due.to.spam@none.provided>
Subject: Re: Zeller's Algorithm
Date: Tue, 30 Jul 2002 12:17:02 -0500
Date: 2002-07-30T17:14:33+00:00 [thread overview]
Message-ID: <3D46CA0E.BCD17D9C@none.provided> (raw)
In-Reply-To: 3D3DED1F.24DE3AC8@lmco.com
Paul A Storm wrote:
>
> Help!
>
> I am trying to find a Ada implementation of Zeller's algorithm that
> works! I have found several on the web
> but none of them have worked right.
>
> For example I tried this one from
> http://www.adapower.com/alg/zeller.html Inputting June 19 2002 returns
> Wednesday, correct. Inputting June 19 1999 produces Sunday, incorrect.
> That's a Saturday. Inputting
> February 3, 2002 produces Friday, incorrect. That's a Sunday. What
> gives?
>
> I have had similar weird results using other similar Ada Zeller versions
> I've found on the web.
>
> I'm wondering if maybe there's a difference in rounding down. Perhaps a
> 83 vs. 95 peculiarity?
> I don't think so. It produces compilation errors using the -gnat83
> switch.
>
> I'm running gnat 3.13a on Sun 2.6
>
> Argh! Anybody got any ideas on how to fix this or know of an Ada
> implementation of Zeller's algorithm
> that works?
>
> Paul Storm
While reviewing the latest Risks Digest, I came across the following
item titled "Possible day-of-week error" concerning the Zeller
algorithm:
http://catless.ncl.ac.uk/Risks/22.18.html#subj10.1
Just thought it may be of interest in this thread.
Rick Maffei
next prev parent reply other threads:[~2002-07-30 17:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-23 23:56 Zeller's Algorithm Paul A Storm
2002-07-24 7:59 ` Thomas Wolf
2002-07-24 21:30 ` Paul A Storm
2002-07-29 8:29 ` Thomas Wolf
2002-07-30 4:35 ` Robert Dewar
2002-07-30 8:20 ` Thomas Wolf
2002-07-30 17:17 ` Rick Maffei [this message]
2002-07-30 22:10 ` Paul A Storm
2002-07-31 10:51 ` Thomas Wolf
2002-07-31 14:33 ` Frank J. Lhota
2002-07-31 19:13 ` Robert A Duff
2002-07-31 19:26 ` Darren New
2002-07-31 20:01 ` Hyman Rosen
2002-07-31 20:15 ` Frank J. Lhota
2002-07-31 21:08 ` Robert A Duff
2002-07-31 22:34 ` Hyman Rosen
2002-07-31 22:57 ` Robert A Duff
2002-08-01 15:17 ` Hyman Rosen
2002-08-01 16:41 ` Frank J. Lhota
2002-07-31 21:15 ` Dan Nagle
2002-07-31 22:36 ` Hyman Rosen
2002-07-31 22:23 ` Matthew Woodcraft
2002-08-02 7:21 ` Thomas Wolf
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