GNU bug report logs - #10699
bug of `date`: why 1/1/2012 is the second week of 2012?

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#10699: closed (bug of `date`: why 1/1/2012 is the second week
 of 2012?)
Date: Thu, 02 Feb 2012 18:32:02 +0000

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Your message dated Thu, 02 Feb 2012 10:30:53 -0800
with message-id <4F2AD65D.6010102 <at> cs.ucla.edu>
and subject line Re: bug#10699: bug of `date`: why 1/1/2012 is the second week of 2012?
has caused the debbugs.gnu.org bug report #10699,
regarding bug of `date`: why 1/1/2012 is the second week of 2012?
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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10699: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10699
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From: "Wang, YuanTao" <ytwang <at> freewheel.tv>
To: "bug-coreutils <at> gnu.org" <bug-coreutils <at> gnu.org>
Subject: bug of `date`: why 1/1/2012 is the second week of 2012?
Date: Thu, 2 Feb 2012 02:25:59 -0600

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$ date -d "2012-01-01 00:00:00" +%U
01

but in "man date"
%U     week number of year, with Sunday as first day of week (00..53)

Is it a bug?

$ uname -r
2.6.18-128.1.6.el5xen

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: "Wang, YuanTao" <ytwang <at> freewheel.tv>
Cc: 10699-done <at> debbugs.gnu.org
Subject: Re: bug#10699: bug of `date`: why 1/1/2012 is the second week of 2012?
Date: Thu, 02 Feb 2012 10:30:53 -0800

On 02/02/2012 12:25 AM, Wang, YuanTao wrote:
> $ date -d "2012-01-01 00:00:00" +%U
> 01
> 
> but in "man date"
> %U     week number of year, with Sunday as first day of week (00..53)
> 
> Is it a bug?

No.  As the manual (which has more detail) says,
"Days in a new year preceding the first Sunday are in week zero."
In 2012 there are no such days, so January 1 is week 1.

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