GNU bug report logs - #10182
Century bug in date utility?

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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#10182: closed (Century bug in date utility?)
Date: Thu, 01 Dec 2011 17:36:02 +0000

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Your message dated Thu, 01 Dec 2011 10:35:31 -0700
with message-id <4ED7BAE3.9070305 <at> redhat.com>
and subject line Re: bug#10182: Century bug in date utility?
has caused the debbugs.gnu.org bug report #10182,
regarding Century bug in date utility?
to be marked as done.

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


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From: Krzysztof Kowalski <krzysztof7kowalski <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: Century bug in date utility?
Date: Thu, 01 Dec 2011 16:34:09 +0100

Hello,

We have 2011,

HOWEVER:

korn% date +%C
20
korn% date
Thu Dec  1 16:26:30 CET 2011


apc%
apc% date +%C
20
apc%
apc% date
Thu Dec  1 16:26:51     2011

And many other call returns that we live in 20 century :)

For a test I changed system time to 1997 and date utility returned 20
century as well :)

-- 
best regards
  -- Kowalski Krzysztof

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From: Eric Blake <eblake <at> redhat.com>
To: Krzysztof Kowalski <krzysztof7kowalski <at> gmail.com>
Cc: 10182-done <at> debbugs.gnu.org
Subject: Re: bug#10182: Century bug in date utility?
Date: Thu, 01 Dec 2011 10:35:31 -0700

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tag 10182 notabug
thanks

On 12/01/2011 08:34 AM, Krzysztof Kowalski wrote:
> Hello,
> 
> We have 2011,
> 
> HOWEVER:
> 
> korn% date +%C
> 20
> korn% date
> Thu Dec  1 16:26:30 CET 2011

Yep.  And this behavior is mandated by POSIX for strftime(), so it is
not a bug.

http://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html

C
    Replaced by the year divided by 100 and truncated to an integer, as
a decimal number. [ tm_year]

That is, it is NOT the "century" in the vernacular (where years in the
range [2001,2100] are collectively called the 21st century), but the
first two digits of the year.  The idea is that you combine %C%y to form %Y.

> 
> For a test I changed system time to 1997 and date utility returned 20
> century as well :)

No, %C in 1997 returned 19.

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

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