Computer bugs in the year 2000
Dave Martindale
dmmartindale at watcgl.UUCP
Sat Feb 2 16:05:39 AEST 1985
In article <974 at utastro.UUCP> nather at utastro.UUCP (Ed Nather) writes:
>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.
Are you absolutely sure of this? (your trailer DOES say you work come
from an astronomy department....)
My understanding was that years divisible by 4 were leap years, except
that years divisible by 100 were not, except that years divisible by
400 were - giving 97 leap days every 400 years.
According to that pattern, 2000 IS a leap year, and the naive year-mod-4
algorithms will work properly until 2099, not 2399.
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