GNU bug report logs - #10455
Date: Possible bug in ISO-8601 formatted dates

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Bob Proulx <bob <at> proulx.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#10455: closed (Date: Possible bug in ISO-8601 formatted dates)
Date: Mon, 09 Jan 2012 17:14:03 +0000

[Message part 1 (text/plain, inline)]

Your message dated Mon, 9 Jan 2012 10:12:42 -0700
with message-id <20120109171242.GA21508 <at> hysteria.proulx.com>
and subject line Re: bug#10455: Date: Possible bug in ISO-8601 formatted dates
has caused the debbugs.gnu.org bug report #10455,
regarding Date: Possible bug in ISO-8601 formatted dates
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
10455: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10455
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Dotan Cohen <dotancohen <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: Date: Possible bug in ISO-8601 formatted dates
Date: Sun, 8 Jan 2012 19:22:09 +0200

It seems that ISO-8601 formated dates are not properly handled by the
date utility. The date utility seems to erroneously add
timezone-shifting when using ISO-8601 dates. This example is fine (see
the date roundtrip to back where it started):
✈saturn:~$ date +%s -d "2006-12-31 22:00"
1167595200
✈saturn:~$ date -d @1167595200
Sun Dec 31 22:00:00 IST 2006

However, adding a "t" between the date and hour (as per ISO 8601)
breaks the roundtrip (the timestamp is wrong):
✈saturn:~$ date +%s -d "2006-12-31t22:00"
1167577200
✈saturn:~$ date -d @1167577200
Sun Dec 31 17:00:00 IST 2006

This is on a love-to-hate Debian-based distro, with GNU coreutils 8.5.
I can confirm the issue on CentOS with date 5.97. Without the "t" the
timestamp is correct:
[root <at> gs beer]# date +%s -d "2006-12-31 22:00"
1167602400
[root <at> gs beer]# date -d @1167602400
Sun Dec 31 22:00:00 UTC 2006

And with it, the timestamp is wrong.
[root <at> gs beer]# date +%s -d "2006-12-31t22:00"
1167577200
[root <at> gs beer]# date -d @1167577200
Sun Dec 31 15:00:00 UTC 2006

Note that IST (from the first server) is UTC+2.


-- 
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com

[Message part 3 (message/rfc822, inline)]

From: Bob Proulx <bob <at> proulx.com>
To: Dotan Cohen <dotancohen <at> gmail.com>
Cc: 10455-done <at> debbugs.gnu.org
Subject: Re: bug#10455: Date: Possible bug in ISO-8601 formatted dates
Date: Mon, 9 Jan 2012 10:12:42 -0700

Dotan Cohen wrote:
> Bob Proulx wrote:
> > GNU date didn't learn how to handle ISO-8601 until very recently.
> > Your version 8.5 doesn't have that code yet.  Here is the NEWS file
> > entry for the change as it went into the recent 8.13 release.
> 
> Thanks, Bob. Have a great week!

Good.  I am going to close the bug report ticket with this message
then.

Bob

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.