[debbugs-tracker] bug#10413: closed (Invalid date result in specific date operations)

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Your message dated Sat, 31 Dec 2011 15:39:58 -0700
with message-id <address@hidden>
and subject line Re: bug#10413: Invalid date result in specific date operations
has caused the debbugs.gnu.org bug report #10413,
regarding Invalid date result in specific date operations
to be marked as done.

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10413: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10413
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> Subject: 
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> Invalid date result in specific date operations
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> Date: 
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> Thu, 29 Dec 2011 15:02:46 -0300
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64;	rv:9.0) Gecko/20111220 Thunderbird/9.0
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> How to repeat:
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> date -d '2011-08-21 + 1 DAY' +%Y-%m-%d
> date -d '2010-10-10 + 1 DAY' +%Y-%m-%d
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> These dates is just when change from normal time UTC-4 to dts UCT-3
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> result: invalid date
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> The same operation with --utc works fine.
> date -d '2011-08-21 + 1 DAY' +%Y-%m-%d --utc
> date -d '2010-10-10 + 1 DAY' +%Y-%m-%d --utc
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--- Begin Message --- Subject: Re: bug#10413: Invalid date result in specific date operations Date: Sat, 31 Dec 2011 15:39:58 -0700 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0

tag 10413 notabug
thanks

On 12/29/2011 11:02 AM, Vicente Pérez M wrote:
> How to repeat:
> 
> 
> date -d '2011-08-21 + 1 DAY' +%Y-%m-%d
> date -d '2010-10-10 + 1 DAY' +%Y-%m-%d
> 
> These dates is just when change from normal time UTC-4 to dts UCT-3
> 
> result: invalid date
> 
> The same operation with --utc works fine.
> date -d '2011-08-21 + 1 DAY' +%Y-%m-%d --utc
> date -d '2010-10-10 + 1 DAY' +%Y-%m-%d --utc

Thanks for the report.  You failed to mention your exact TZ settings,
although you hinted at it via 'dts UTC-3', but the behavior you observed
is by design and not a bug.  In particular time zones, attempts to land
in a time that falls during the skipped hour are rejected, and using UTC
(which has no daylight savings) is a correct way to avoid the issue.
Another way is to pinpoint times to noon rather than the default of
midnight (no known time zone has a daylight savings transition at noon),
since your particular time zone appears to be among those zones where
the daylight savings rules kick in at midnight:

date -d '2011-08-21 12:00pm + 1 day' +%Y-%m-%d

More on this topic can be found in the FAQ:
https://www.gnu.org/software/coreutils/faq/#The-date-command-is-not-working-right_002e

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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