Bug 12061 - /bin/date does not interpret TZ as expected
/bin/date does not interpret TZ as expected
Product: Red Hat Linux
Classification: Retired
Component: sh-utils (Show other bugs)
i386 Linux
low Severity high
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Assigned To: bero
Depends On:
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Reported: 2000-06-10 14:21 EDT by thoth
Modified: 2008-05-01 11:37 EDT (History)
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Doc Type: Bug Fix
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Last Closed: 2001-01-06 16:27:27 EST
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Description thoth 2000-06-10 14:21:21 EDT
The time zone as reported by date does not necessarily result in correct
behavior when used for the TZ envariable.

[thoth@maya thoth]$ date
Sat Jun 10 14:16:37 EDT 2000
[thoth@maya thoth]$ date +%Z
[thoth@maya thoth]$ TZ=EDT date
Sat Jun 10 18:16:47 EDT 2000
[thoth@maya thoth]$ TZ=Z date
Sat Jun 10 18:16:58  2000

What is the TZ for EDT anyway?
Comment 1 Jeff Johnson 2001-01-06 14:20:35 EST
This is expected behavior, unknown time zones (like TZ=Z above) use either UTC
the native system time w/o timezone modification. Here's what I see on a machine
that keeps time
in UTC, but is in timezone EST:

bash$ date
Sat Jan  6 14:23:03 EST 2001
bash$ TZ=yadda_yadda date
Sat Jan  6 19:23:06 yadda_yadda 2001
bash$ TZ=UTC date
Sat Jan  6 19:23:19 UTC 2001
bash$ TZ=Z date
Sat Jan  6 19:23:28  2001
Comment 2 thoth 2001-01-06 15:28:41 EST
What is the TZ for EDT anyway?
Comment 3 Jeff Johnson 2001-01-06 16:12:08 EST
Eastern Daylight Time, GMT-4, same as New York City.
Comment 4 thoth 2001-01-06 16:24:53 EST
[hammor@comstar3 hammor]$ date
Sat Jan  6 21:28:11 GMT 2001
[hammor@comstar3 hammor]$ TZ=Eastern date
Sat Jan  6 21:28:20 Eastern 2001
[hammor@comstar3 hammor]$ TZ=GMT-4 date
Sun Jan  7 01:28:26 GMT 2001

Please provide sample command line to output the date in Eastern on a machine
with a different /etc/localtime .  Please provide documentation pointers to
derive the proper values for the TZ environment variable for other time zones.

  Consider placing this documentation (or a reference to it) in the manual page
for the date command.
Comment 5 thoth 2001-01-06 16:27:24 EST
Is there any way to get the date command to print out the proper value for the
TZ environment variable?
Comment 6 Jeff Johnson 2001-01-06 16:46:09 EST
TZ is perfectly documented in "info libc", search for TZ.

There is no way that date can print out "proper" settings, as the problem is
to defing "proper".

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