GNU bug report logs - #17451
date command: Bug?

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eric Blake <eblake <at> redhat.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#17451: closed (date command: Bug?)
Date: Sat, 10 May 2014 19:20:04 +0000

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Your message dated Sat, 10 May 2014 13:19:03 -0600
with message-id <536E7BA7.2050607 <at> redhat.com>
and subject line Re: bug#17451: date command: Bug?
has caused the debbugs.gnu.org bug report #17451,
regarding date command: Bug?
to be marked as done.

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


-- 
17451: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17451
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Contact help-debbugs <at> gnu.org with problems

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From: "Yin, Dazhong <at> ARB" <dyin <at> arb.ca.gov>
To: "bug-coreutils <at> gnu.org" <bug-coreutils <at> gnu.org>
Subject: date command: Bug?
Date: Fri, 9 May 2014 18:07:06 +0000

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When querying the time zone, the date command cannot deal with the hour when time changes from standard time to daylight saving time.  Below examples show the tests done in the Pacific time zone.

-----------------------------------------------------------------------------------------------------------------------------------------------

date -d "20120311 01" +%:::z
-08

date -d "20120311 02" +%:::z
date: invalid date `20120311 02'

date -d "20120311 03" +%:::z
-07

date -d "20140309 01" +%:::z
-08

date -d "20140309 02" +%:::z
date: invalid date `20140309 02'

date -d "20140309 03" +%:::z
-07

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From: Eric Blake <eblake <at> redhat.com>
To: "Yin, Dazhong <at> ARB" <dyin <at> arb.ca.gov>, 17451-done <at> debbugs.gnu.org
Subject: Re: bug#17451: date command: Bug?
Date: Sat, 10 May 2014 13:19:03 -0600

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tag 17451 notabug
thanks

On 05/09/2014 12:07 PM, Yin, Dazhong <at> ARB wrote:
> When querying the time zone, the date command cannot deal with the hour when time changes from standard time to daylight saving time.

That's because that hour does not exist in your timezone.

All of your examples look like correct behavior to me.  You've asked a FAQ:
https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-command-is-not-working-right_002e

Our advice is to compute dates in UTC, or when sticking to a locale with
daylight savings, then compute dates relative to noon rather than near
the hour that might disappear or be doubled.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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