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Article #382Re: Computer bugs in the year 2000
From: Theo van der Storm
Date: Sun, 03 Feb 1985 16:08
Date: Sun, 03 Feb 1985 16:08
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In article <7927@brl-tgr.ARPA> ron@brl-tgr.ARPA (Ron Natalie <ron>) writes:
>> For those of you fixing things in your software:
>>
>> The year 2000 *is* a leap year, despite what many algorithms tell you.
>> The year 2400 is *not* a leap year.
>>
>> With minimal effort, you can make things work until 2399. You may be
>> subject to complaints after that.
>>
>Now you've really got me confused. Why is 2400 not a leap year?
(msd = mean solar day)
1 year = 365.2422 msd = 365 + 1/4 - 1/100 + 1/400 + error
That's why we have:
leapyear 1 out of 4
non leap year 1 out of 100
leapyear 1 out of 400 (So 2400 is a leap year.)
Read any basic astronomy book.
--
Theo van der Storm, 52 20'N / 4 52'E, {seismo|decvax|philabs}!mcvax!vu44!tstorm
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83 (MC830713); site vu44.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!genrad!panda!talcott!harvard!seismo!mcvax!vu44!tstorm From: tstorm@vu44.UUCP (Theo van der Storm) Newsgroups: net.bugs,net.flame,net.puzzle Subject: Re: Computer bugs in the year 2000 Message-ID: <587@vu44.UUCP> Date: Sun, 3-Feb-85 11:08:10 EST Article-I.D.: vu44.587 Posted: Sun Feb 3 11:08:10 1985 Date-Received: Tue, 5-Feb-85 03:56:01 EST References: <246@cheviot.UUCP> <974@utastro.UUCP> <7927@brl-tgr.ARPA> Reply-To: tstorm@vu44.UUCP (PUT YOUR NAME HERE) Distribution: net Organization: VU Informatica, Amsterdam Lines: 21 Keywords: leap year mean solar day Summary: WHY 2100, 2200, and 2300 leapyears and 2000, 2400 not.