GNU bug report logs - #16386
maybe a small Bug in date?

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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#16386: closed (maybe a small Bug in date?)
Date: Tue, 07 Jan 2014 17:12:02 +0000

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Your message dated Tue, 07 Jan 2014 10:10:58 -0700
with message-id <52CC3522.1090508 <at> redhat.com>
and subject line Re: bug#16386: maybe a small Bug in date?
has caused the debbugs.gnu.org bug report #16386,
regarding maybe a small Bug in date?
to be marked as done.

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


-- 
16386: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16386
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From: <thomas.dohl <at> soluvia.de>
To: <bug-coreutils <at> gnu.org>
Subject: maybe a small Bug in date?
Date: Tue, 7 Jan 2014 15:37:51 +0000

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Hello,

could this be a bug in date?
date --version
	date (GNU coreutils) 8.4
	Copyright (C) 2010 Free Software Foundation, Inc.
	License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>.
	This is free software: you are free to change and redistribute it.
	There is NO WARRANTY, to the extent permitted by law.

	Written by David MacKenzie.

bug report:
------------------------------------------------------
OK: 		date 						-> Tue Jan
7 16:27:06 CET 2014

OK:		date +%V_%Y -d "last wednesday" 		-> 01_2014
OK: 		date +%V_%Y -d "last wednesday +1 week"	-> 02_2014
...
OK: 		date +%V_%Y -d "last wednesday +51 week"	-> 52_2014
WRONG:  	date +%V_%Y -d "last wednesday +52 week"	-> 01_2014
This should be 01_2015:					            ^^^^
OK: 		date +%V_%Y -d "last wednesday +53 week"	-> 02_2015
OK: 		date +%V_%Y -d "last wednesday +54 week"	-> 03_2015
...



My system:
uname -a
	Linux ... 2.6.32-431.1.2.0.1.el6.x86_64 #1 SMP Fri Dec 13 13:06:13
UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
less /etc/redhat-release
	CentOS release 6.5 (Final)


Thanks and best regards.
Thomas Dohl


Mit freundlichen Grüßen,
Soluvia IT-Services GmbH
Netz & Security / Rechenzentrum & Infrastruktur
Thomas Dohl

Telefon: +49 (0)621-290-3839
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From: Eric Blake <eblake <at> redhat.com>
To: thomas.dohl <at> soluvia.de, 16386-done <at> debbugs.gnu.org
Subject: Re: bug#16386: maybe a small Bug in date?
Date: Tue, 07 Jan 2014 10:10:58 -0700

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tag 16386 notabug
thanks

On 01/07/2014 08:37 AM, thomas.dohl <at> soluvia.de wrote:
> Hello,
> 
> could this be a bug in date?

Thanks for the report.  However, this is not a bug in date, but a
misunderstanding on your part, covered in our FAQ.

https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-command-is-not-working-right_002e

> 
> OK:		date +%V_%Y -d "last wednesday" 		-> 01_2014

Do not mix %V and %Y.  %V goes with %G, %Y goes with %U or %W.

> OK: 		date +%V_%Y -d "last wednesday +1 week"	-> 02_2014
> ...
> OK: 		date +%V_%Y -d "last wednesday +51 week"	-> 52_2014
> WRONG:  	date +%V_%Y -d "last wednesday +52 week"	-> 01_2014
> This should be 01_2015:					            ^^^^

No, you are using the wrong format string.  When you mix two different
formats that use different notions of when a year rolls over, you are
bound to get confusing results.  But those results are correct, once you
re-read the documentation of what those format strings represent.

> Diese E-Mail könnte vertrauliche und/oder rechtlich geschützte Informationen

This disclaimer is unenforceable on a publicly-archived mailing list.
It is considered poor email etiquette to open source lists to use your
employer's email if they are going to tack on garbage.

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

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