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On Wed, 5 Dec 2007, Mike Miller wrote:
My brother's birthday is on November 22. Once every 7 years, on
average, his birthday falls on Thanksgiving. I was curious about when
exactly that would occur in the future so I did something like this in
the bash shell on a GNU Linux system:
for year in $(seq 2008 2060) ; do date -d 11/22/$year | grep Thu ; done
And if you try it, you'll see what happens -- it fails starting in 2038.
It also fails if you go back before 1970.
Just for kicks, this works for any range of years:
for year in $(seq 1960 2060) ; do cal 11 $year | egrep -B5 '^18 19 20 21 22' | grep November ; done
That is, it shows you every November for the given range of years where
the 22nd fell on a Thursday. Thanksgiving wasn't on the fourth Thursday
of November until the 1930s -- before that it was on the final Thursday
and therefore would always have been on 11/29 instead of on 11/22.
Funny what you can do easily with these GNU programs, eh?
Mike
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