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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: Y2K Issues
Date: 1998/10/20
Message-ID: <EACHUS.98Oct20172657@spectre.mitre.org>#1/1
X-Deja-AN: 403315546
References: <362B53A3.64E266AB@res.raytheon.com> <362B8D2F.802F42E6@lmco.com>
Organization: The Mitre Corp., Bedford, MA.
Newsgroups: comp.lang.ada
Date: 1998-10-20T00:00:00+00:00
List-Id: <comp.lang.ada>

In article <362B8D2F.802F42E6@lmco.com> Howard W LUDWIG <howard.w.ludwig@lmco.com> writes:

 > [Note:  The fully general rule for leap year is that Year is a leap year
 > if and only if
 >   (Year mod 4) = 0 and
 >   ((Year mod 100) /= 0 or (Year mod 400) = 0).]

   Actually, there is another reason to wait to fix the Ada "Doom
Date" of December 31, 2099.  The current "Gregorian" calendar is
accurate to about one day in 3000 years.  Several proposals for how to
"fix" the leap year to deal with this have been proposed, most of
which would make the year 4000 AD not a leap year in contradiction to
the above rule.  I keep hoping that some government (or a Pope again)
will get around to dealing with this issue, since it is actually
starting to become important.  (You may not build things expected to
work for over 2000 years, but there is already one satellite in orbit
with an expected useful lifetime four times that.)
--

					Robert I. Eachus

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