Article View: comp.sys.mac
Article #4164Week DAYS (was Re: why 1904? ms excel)
From: Jeff Hallett x4-6328
Date: Thu, 07 Sep 1989 14:12
Date: Thu, 07 Sep 1989 14:12
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1511 bytes
In article <8909061947.AA00416@vs04csc.UMD.EDU> russotto@wam.UMD.EDU writes:
>The easy answer is that the Mac OS does it from 1904. The deeper reason
>for it, though, is that there is an easier leap year rule for dates
>starting in 1904 and going to a date < 2100. That is, for those
>dates, a leap year is any year divisible by 4. If you include 1900,
>a leap year is any year divisible by four that is either not divisible
>by 100, or is divisible by 400.
Interesting. One thing I've always wondered about, though, is, given
a date in the Gregorian calendar, how does one determine the day of
the week? There is obviously a brute force approach, but does someone
know (and will relate) an elegant solution?
Thanks
--
Jeffrey A. Hallett, PET Software Engineering
GE Medical Systems, W641, PO Box 414
Milwaukee, WI 53201
(414) 548-5163 : EMAIL - hallett@positron.gemed.ge.com
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!mrsvr.UUCP!shoreland.uucp!hallett From: hallett@shoreland.uucp (Jeff Hallett x4-6328) Newsgroups: comp.sys.mac Subject: Week DAYS (was Re: why 1904? ms excel) Message-ID: <972@mrsvr.UUCP> Date: 7 Sep 89 14:12:35 GMT References: <457a7553.1285f@maize.engin.umich.edu> <8909061947.AA00416@vs04csc.UMD.EDU> Sender: news@mrsvr.UUCP Reply-To: hallett@shoreland.UUCP (Jeff Hallett x4-6328) Organization: GE Medical Systems, Milwaukee, WI Lines: 20