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: "Wang, YuanTao" <ytwang <at> freewheel.tv>
Subject: bug#10699: closed (Re: bug#10699: 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 bug report

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

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 10699 <at> debbugs.gnu.org.

-- 
10699: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10699
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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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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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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