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If an invalid TZ argument is passed to /bin/date, it silently fails but prints the UTC result:
[dberry@dberry ~]$ TZ=EDT date -d @0
Thu Jan  1 00:00:00 EDT 1970
[dberry@dberry ~]$ TZ=foo date -d @0
Thu Jan  1 00:00:00 foo 1970

It works correctly if using no argument or a valid argument:
[dberry@dberry ~]$ date -d @0
Wed Dec 31 19:00:00 EST 1969
[dberry@dberry ~]$ TZ=EST5EDT date -d @0
Wed Dec 31 19:00:00 EST 1969
[dberry@dberry ~]$ TZ=UTC date -d @0
Thu Jan  1 00:00:00 UTC 1970

[dberry@dberry ~]$ rpm -q coreutils
coreutils-8.4-19.el6.x86_64
[dberry@dberry ~]$ uname -a
Linux dberry.csb 2.6.32-279.19.1.el6.x86_64 #1 SMP Sat Nov 24 14:35:28 EST 2012 x86_64 x86_64 x86_64 GNU/Linux
[dberry@dberry ~]$ cat /etc/redhat-release 
Red Hat Enterprise Linux Workstation release 6.3 (Santiago)
[dberry@dberry ~]$ date
Thu Apr 18 16:23:46 EDT 2013

Donald Berry, RHCE
Technical Account Manager
Red Hat Canada Ltd.
mobile: 647-338-6329





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Subject: bug#14229: Acknowledgement (invalid TZ and /bin/date)
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On 04/18/13 13:24, Donald Berry wrote:
> If an invalid TZ argument is passed to /bin/date,
> it silently fails but prints the UTC result

In the GNU system there is no such thing
as an invalid TZ string.  Every TZ string has
some interpretation (typically as UTC).
This is true not just for /bin/date, but for
every other program.





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Yes, date/GNU accepts whatever TZ string you pass it without error, but this leads to very confusing results.  Here again is one of the examples:

[dberry <at> dberry ~]$ TZ=foo date -d @0
Thu Jan  1 00:00:00 foo 1970

I think it is safe to say that 'foo' is not a valid timezone, and yet date returns the UTC result, but displays it as timezone foo.

Even more confusing is using a string that the user may think is valid, such as EDT.  Again date returns the UTC result, but displays it as timezone EDT.

[dberry <at> dberry ~]$ TZ=EDT date -d @0
Thu Jan  1 00:00:00 EDT 1970

It seems that when date does not understand the string it returns the UTC result, but echoes the string back as the apparent timezone, or at least attempts to - date has a limit on the number of characters it supports:

[dberry@dberry ~]$ TZ=America/Eastern date -d @0 # invalid TZ string
Thu Jan  1 00:00:00 America 1970

There are other strings that date does understand, and in fact translates them into another timezone in the output, e.g.:

[dberry@dberry ~]$ TZ=America/Phoenix date -d @0
Wed Dec 31 17:00:00 MST 1969

Is there any documentation of what the supported/recognized TZ strings are?  Are there any plans to reject invalid strings?  I did see there was a similar bug reported in 2011 (http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9614).  

Don

----- Original Message -----
From: "Paul Eggert" <eggert@HIDDEN>
To: "Donald Berry" <dberry@HIDDEN>
Cc: 14229 <at> debbugs.gnu.org
Sent: Thursday, April 18, 2013 5:29:33 PM
Subject: Re: bug#14229: invalid TZ and /bin/date

On 04/18/13 13:24, Donald Berry wrote:
> If an invalid TZ argument is passed to /bin/date,
> it silently fails but prints the UTC result

In the GNU system there is no such thing
as an invalid TZ string.  Every TZ string has
some interpretation (typically as UTC).
This is true not just for /bin/date, but for
every other program.





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On Friday 19 April 2013 15:47:46 Donald Berry wrote:
> Yes, date/GNU accepts whatever TZ string you pass it without error, but
> this leads to very confusing results.
Paul said the "GNU system", not "GNU/date".  coreutils doesn't parse the TZ=
=20
env var, the C library does.  similarly, the date program doesn't do the ti=
me=20
parsing, it relies on the C library to handle these details.  your use of=20
`date` here is just the simplest way from the command line to test the C=20
library.  you can write C code that calls the timezone funcs and see the sa=
me=20
behavior.

> Is there any documentation of what the supported/recognized TZ strings ar=
e?
>  Are there any plans to reject invalid strings?

in the GNU system, that means glibc does the parsing.  so review the glibc=
=20
manual for details:
http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
=2Dmike

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On Friday 19 April 2013 15:47:46 Donald Berry wrote:
> Yes, date/GNU accepts whatever TZ string you pass it without error, but
> this leads to very confusing results.
Paul said the "GNU system", not "GNU/date".  coreutils doesn't parse the TZ=
=20
env var, the C library does.  similarly, the date program doesn't do the ti=
me=20
parsing, it relies on the C library to handle these details.  your use of=20
`date` here is just the simplest way from the command line to test the C=20
library.  you can write C code that calls the timezone funcs and see the sa=
me=20
behavior.

> Is there any documentation of what the supported/recognized TZ strings ar=
e?
>  Are there any plans to reject invalid strings?

in the GNU system, that means glibc does the parsing.  so review the glibc=
=20
manual for details:
http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
=2Dmike

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On 04/18/2013 01:24 PM, Donald Berry wrote:
> If an invalid TZ argument is passed to /bin/date, it silently fails but=
 prints the UTC result:
> [dberry@dberry ~]$ TZ=3DEDT date -d @0
> Thu Jan  1 00:00:00 EDT 1970
> [dberry@dberry ~]$ TZ=3Dfoo date -d @0
> Thu Jan  1 00:00:00 foo 1970
>=20
> It works correctly if using no argument or a valid argument:
> [dberry@dberry ~]$ date -d @0
> Wed Dec 31 19:00:00 EST 1969
> [dberry@dberry ~]$ TZ=3DEST5EDT date -d @0
> Wed Dec 31 19:00:00 EST 1969
> [dberry@dberry ~]$ TZ=3DUTC date -d @0
> Thu Jan  1 00:00:00 UTC 1970
>=20
> [dberry@dberry ~]$ rpm -q coreutils
> coreutils-8.4-19.el6.x86_64
> [dberry@dberry ~]$ uname -a
> Linux dberry.csb 2.6.32-279.19.1.el6.x86_64 #1 SMP Sat Nov 24 14:35:28 =
EST 2012 x86_64 x86_64 x86_64 GNU/Linux
> [dberry@dberry ~]$ cat /etc/redhat-release=20
> Red Hat Enterprise Linux Workstation release 6.3 (Santiago)
> [dberry@dberry ~]$ date
> Thu Apr 18 16:23:46 EDT 2013

This is really annoying and confusing.
However as I understand it, there is no interface currently
that coreutils can use, to determine that a match wasn't found.
All I can recommend is to use location based zone instead
which have less scope for mismatches:
http://www.pixelbeat.org/docs/linux_timezones/

thanks,
P=C3=A1draig.




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On 04/19/2013 12:47 PM, Donald Berry wrote:
> Are there any plans to reject invalid strings?

Not as far as I know.




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severity 11748 wishlist

severity 14229 wishlist

tags 9614 - wontfix

merge 9614 11748 14229





Message received at control <at> debbugs.gnu.org:


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To: GNU bug control <control <at> debbugs.gnu.org>
From: Paul Eggert <eggert@HIDDEN>
Subject: 11748 is wishlist and duplicate
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severity 11748 wishlist

severity 14229 wishlist

tags 9614 - wontfix

merge 9614 11748 14229






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