[debbugs-tracker] bug#16386: closed (maybe a small Bug in date?)

[GNU bug Tracking System]

Your message dated Tue, 07 Jan 2014 10:10:58 -0700
with message-id <address@hidden>
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
address@hidden)


-- 
16386: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16386
GNU Bug Tracking System
Contact address@hidden with problems

--- Begin Message --- Subject: maybe a small Bug in date? Date: Tue, 7 Jan 2014 15:37:51 +0000

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
Fax:      +49 (0)621-290-2677
E-Mail:  address@hidden
Internet: www.soluvia-it-services.de

Soluvia IT-Services GmbH . Uhlenkrog 32 . 24113 Kiel
Büro Mannheim: Luisenring 49, 68159 Mannheim
Handelsregister-Nr. HRB 7458Ki, Sitz und Amtsgericht: Kiel
Geschäftsführer: Dr. Dirk Bevers, Dr. Simon Kalvoda

Diese E-Mail könnte vertrauliche und/oder rechtlich geschützte Informationen
enthalten. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail
irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und
vernichten Sie diese E-Mail. Das unerlaubte Kopieren sowie die unbefugte
Weitergabe dieser E-Mail ist nicht gestattet.

smime.p7s
Description: S/MIME cryptographic signature

--- End Message ---

--- Begin Message --- Subject: Re: bug#16386: maybe a small Bug in date? Date: Tue, 07 Jan 2014 10:10:58 -0700 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

tag 16386 notabug
thanks

On 01/07/2014 08:37 AM, address@hidden 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

signature.asc
Description: OpenPGP digital signature

--- End Message ---