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@HIDDEN>; Keywords: confirmed; dated Mon, 25 Aug 2014 16:02:01 UTC; Maintainer for coreutils is bug-coreutils@HIDDEN.

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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
To: Assaf Gordon <assafgordon@HIDDEN>
Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
References: <87ppfo36er.fsf@HIDDEN>
 <c8968416-98b5-74ba-ffbe-cd49a23b173c@HIDDEN>
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AG> I hope to get to this bug soon.

Good.




Information forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text 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@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) confirmed. Request was from Assaf Gordon <assafgordon@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#18328: can't say date -d '8pm -0500' though other combos work
To: =?UTF-8?B?56mN5Li55bC8IERhbiBKYWNvYnNvbg==?= <jidanni@HIDDEN>,
 18328 <at> debbugs.gnu.org
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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




Information forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.

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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
To: bug-coreutils@HIDDEN
Subject: can't say date -d '8pm -0500' though other combos work
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$ date -d '8pm -0500'
date: invalid date =E2=80=988pm -0500=E2=80=99 <--why can't this combo wo=
rk?
$ date -d '20:00 -0500'
=E4=BA=8C  8=E6=9C=88 26 09:00:00 CST 2014
$ date -d 'sun 8pm'
=E6=97=A5  8=E6=9C=88 31 20:00:00 CST 2014
$ date -d '8pm'
=E4=B8=80  8=E6=9C=88 25 20:00:00 CST 2014




Acknowledgement sent to 積丹尼 Dan Jacobson <jidanni@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-coreutils@HIDDEN. Full text available.
Report forwarded to bug-coreutils@HIDDEN:
bug#18328; Package coreutils. Full text available.
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