GNU bug report logs - #8930
date +%C

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Dimitri Tassiaux <d.tassiaux <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: date +%C
Date: Fri, 24 Jun 2011 20:39:41 +0200

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~$ *date*
vendredi 24 juin 2011, 20:32:50 (UTC+0200)
~$ *date +%C*
20


*# 21st Century !*



Dimitri Tassiaux


[image: bug date.png]




-- 
Si tu as une pomme, que j'ai une pomme, et que l'on échange nos pommes, nous
aurons chacun une pomme. Mais si tu as une idée, que j'ai une idée et que
l'on échange nos idées, nous aurons chacun deux idées.
George Bernard Shaw (1856-1950)

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Message #8 received at 8930 <at> debbugs.gnu.org (full text, mbox):

From: Dimitri Tassiaux <d.tassiaux <at> gmail.com>
To: 8930 <at> debbugs.gnu.org
Subject: $date +%C
Date: Fri, 24 Jun 2011 20:57:27 +0200

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*Century error !*

date (GNU coreutils) 8.5
Copyright © 2010 Free Software Foundation, Inc.
License GPLv3+ : GNU GPL version 3 ou ultérieure
<http://gnu.org/licenses/gpl.html>
Ceci est logiciel libre, vous êtes libre de le modifier et de le
redistribuer.
Ce logiciel n'est accompagné d'ABSOLUMENT AUCUNE GARANTIE, dans les limites
autorisees par la loi applicable.

Écrit par David MacKenzie.

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Message #13 received at 8930-done <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: Dimitri Tassiaux <d.tassiaux <at> gmail.com>, 8930-done <at> debbugs.gnu.org
Subject: Re: date +%C
Date: Fri, 24 Jun 2011 13:52:02 -0600

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tag 8930 notabug
thanks

> ~$ *date*
> vendredi 24 juin 2011, 20:32:50 (UTC+0200)
> ~$ *date +%C*
> 20
> 
> 
> *# 21st Century !*
> 

Thanks for the report.  However, this is not a bug.

%C does not mean the century in common parlance, rather, according to
POSIX, it means:

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/date.html

> 
> %C
>     Century (a year divided by 100 and truncated to an integer) as a decimal number [00,99].

Yes, the mnemonic is using century for lack of a better term, but it is
correctly printing all but the last two digits of the year.

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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Message #16 received at 8930 <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: 8930 <at> debbugs.gnu.org
Subject: Re: bug#8930: date +%C
Date: Fri, 24 Jun 2011 15:16:52 -0600

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On 06/24/2011 01:52 PM, Eric Blake wrote:
> %C does not mean the century in common parlance, rather, according to
> POSIX, it means:
> 
> http://pubs.opengroup.org/onlinepubs/9699919799/utilities/date.html
> 
>>
>> %C
>>     Century (a year divided by 100 and truncated to an integer) as a decimal number [00,99].
> 
> Yes, the mnemonic is using century for lack of a better term, but it is
> correctly printing all but the last two digits of the year.

That said, you found a bug in POSIX.  %C can be larger than 99, since it
maps to the same construct in strftime().

http://austingroupbugs.net/view.php?id=466

-- 
Eric Blake   eblake <at> redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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Message #19 received at 8930 <at> debbugs.gnu.org (full text, mbox):

From: James Youngman <jay <at> gnu.org>
To: Dimitri Tassiaux <d.tassiaux <at> gmail.com>
Cc: 8930 <at> debbugs.gnu.org
Subject: Re: bug#8930: $date +%C
Date: Sat, 25 Jun 2011 21:18:18 +0100

2011/6/24 Dimitri Tassiaux <d.tassiaux <at> gmail.com>:
> *Century error !*

This isn't a very intelligible bug report.   When reporting a bug in
software please state as precisely as possible:
1. What you did.
2. What you expected to happen.
3. What actually did happen.

In this case I assume you think that %C prints the century, for
example 21.   It turns out that it doesn't.   From the documentation:
       %C     century; like %Y, except omit last two digits (e.g., 20)

I agree though that using the word "century" here is misleading.

> date (GNU coreutils) 8.5
> Copyright © 2010 Free Software Foundation, Inc.
> License GPLv3+ : GNU GPL version 3 ou ultérieure
> <http://gnu.org/licenses/gpl.html>
> Ceci est logiciel libre, vous êtes libre de le modifier et de le
> redistribuer.
> Ce logiciel n'est accompagné d'ABSOLUMENT AUCUNE GARANTIE, dans les limites
> autorisees par la loi applicable.
>
> Écrit par David MacKenzie.
>

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