GNU bug report logs - #18328
date: '8pm -0500' is invalid (am/pm problem)

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Package: coreutils;

Reported by: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>

Date: Mon, 25 Aug 2014 16:02:01 UTC

Severity: normal

Tags: confirmed

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Report forwarded to bug-coreutils <at> gnu.org:
bug#18328; Package coreutils. (Mon, 25 Aug 2014 16:02:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>:
New bug report received and forwarded. Copy sent to bug-coreutils <at> gnu.org. (Mon, 25 Aug 2014 16:02:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-coreutils <at> gnu.org
Subject: can't say date -d '8pm -0500' though other combos work
Date: Tue, 26 Aug 2014 00:01:16 +0800

$ date -d '8pm -0500'
date: invalid date ‘8pm -0500’ <--why can't this combo work?
$ date -d '20:00 -0500'
二  8月 26 09:00:00 CST 2014
$ date -d 'sun 8pm'
日  8月 31 20:00:00 CST 2014
$ date -d '8pm'
一  8月 25 20:00:00 CST 2014
Information forwarded to bug-coreutils <at> gnu.org:
bug#18328; Package coreutils. (Sat, 20 Oct 2018 04:26:02 GMT) Full text and rfc822 format available.

Message #8 received at 18328 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>,
 18328 <at> debbugs.gnu.org
Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
Date: Fri, 19 Oct 2018 22:25:00 -0600

tags 18328 confirmed
retitle 18328 date: '8pm -0500' is invalid (am/pm problem)
stop

(triaging old bugs)

Hello,

On 25/08/14 10:01 AM, 積丹尼 Dan Jacobson wrote:
> $ date -d '8pm -0500'
> date: invalid date ‘8pm -0500’ <--why can't this combo work?

This is indeed a bug (specifically in gnulib's date parsing module,
but easier to track here).

It seems the existence of the "am/pm" string causes the parser
to take a slightly different rule, then reject additional relative
values, unless they have a unit, e.g.:

  $ date --debug -d '8pm +5 days'
  date: parsed time part: 08:00:00pm
  date: parsed relative part: +5 day(s)
  [...]

Contrast it with a different (and confusing) rules when there is
no "am/pm", the relative number is always taken as the time zone, e.g.:

  $ date --debug -d '8:00 +5 days'
  date: parsed time part: 08:00:00 UTC+05
  date: parsed relative part: +1 day(s)
  date: input timezone: parsed date/time string (+05)
  [...]

(from https://bugs.gnu.org/17161#31 )

I hope to get to this bug soon.

-assaf
Added tag(s) confirmed. Request was from Assaf Gordon <assafgordon <at> gmail.com> to control <at> debbugs.gnu.org. (Sat, 20 Oct 2018 04:26:02 GMT) Full text and rfc822 format available.
Changed bug title to 'date: '8pm -0500' is invalid (am/pm problem)' from 'can't say date -d '8pm -0500' though other combos work' Request was from Assaf Gordon <assafgordon <at> gmail.com> to control <at> debbugs.gnu.org. (Sat, 20 Oct 2018 04:26:02 GMT) Full text and rfc822 format available.
Information forwarded to bug-coreutils <at> gnu.org:
bug#18328; Package coreutils. (Sat, 20 Oct 2018 06:31:02 GMT) Full text and rfc822 format available.

Message #15 received at 18328 <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: Assaf Gordon <assafgordon <at> gmail.com>
Cc: 18328 <at> debbugs.gnu.org
Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
Date: Sat, 20 Oct 2018 14:30:25 +0800

AG> I hope to get to this bug soon.

Good.
This bug report was last modified 6 years and 240 days ago.

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