[debbugs-tracker] bug#10182: closed (Century bug in date utility?)

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Your message dated Thu, 01 Dec 2011 10:35:31 -0700
with message-id <address@hidden>
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.

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10182: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10182
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> --- Begin Message ---
>
>
>
> Subject: 
>
> Century bug in date utility?
>
>
>
>
> Date: 
>
> Thu, 01 Dec 2011 16:34:09 +0100
>
>
>
>
> User-agent: 
>
> Mozilla/5.0 (Windows NT 6.1; WOW64;	rv:8.0) Gecko/20111105 Thunderbird/8.0
>
>
>
>
> 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
>
>
>
>
> --- End Message ---

--- Begin Message --- Subject: Re: bug#10182: Century bug in date utility? Date: Thu, 01 Dec 2011 10:35:31 -0700 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111115 Thunderbird/8.0

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

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