There is a bug in GNU date which manifests itself when TZ has no value in
the environment. See transcript below:
niall@bagend:~ >echo $TZ
niall@bagend:~ >for day in mon tues wednes thurs fri satur sun
do date -d "last ${day}day"
done
Mon Apr 1 00:00:00 IST 2002
Tue Apr 2 00:00:00 IST 2002
Wed Apr 3 00:00:00 IST 2002
Wed Mar 27 23:00:00 GMT 2002
Thu Mar 28 23:00:00 GMT 2002
Fri Mar 29 23:00:00 GMT 2002
Sat Mar 30 23:00:00 GMT 2002
niall@bagend:~ >export TZ=GMT
niall@bagend:~ >date
Thu Apr 4 14:14:30 GMT 2002
niall@bagend:~ >for day in mon tues wednes thurs fri satur sun
do date -d "last ${day}day"
done
Mon Apr 1 00:00:00 GMT 2002
Tue Apr 2 00:00:00 GMT 2002
Wed Apr 3 00:00:00 GMT 2002
Thu Mar 28 00:00:00 GMT 2002
Fri Mar 29 00:00:00 GMT 2002
Sat Mar 30 00:00:00 GMT 2002
Sun Mar 31 00:00:00 GMT 2002
niall@bagend:~ >export TZ=IST
niall@bagend:~ >for day in mon tues wednes thurs fri satur sun
do date -d "last ${day}day"
done
Mon Apr 1 00:00:00 IST 2002
Tue Apr 2 00:00:00 IST 2002
Wed Apr 3 00:00:00 IST 2002
Thu Mar 28 00:00:00 IST 2002
Fri Mar 29 00:00:00 IST 2002
Sat Mar 30 00:00:00 IST 2002
Sun Mar 31 00:00:00 IST 2002
niall@bagend:~ >export TZ=
niall@bagend:~ >for day in mon tues wednes thurs fri satur sun; do date -d
"last ${day}day"; done
Mon Apr 1 00:00:00 UTC 2002
Tue Apr 2 00:00:00 UTC 2002
Wed Apr 3 00:00:00 UTC 2002
Thu Mar 28 00:00:00 UTC 2002
Fri Mar 29 00:00:00 UTC 2002
Sat Mar 30 00:00:00 UTC 2002
Sun Mar 31 00:00:00 UTC 2002
I have verified this with several distributions of Gnu/Linux, all of which
used sh-utils 2.0. I got and compiled 2.0.11 from alpha.gnu.org and the bug
persists in this version.
Kindest regards,
Niall O Broin
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