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Re: Bug in date command

From: Bob Proulx
Subject: Re: Bug in date command
Date: Wed, 7 Jan 2009 13:27:51 -0700
User-agent: Mutt/1.5.13 (2006-08-11)

Bob Kline wrote:
> The date command reports the wrong ISO week number in some cases.  For
> example:
> $ date -d 2008-12-31 +%Y%V
> 200801
> Clearly the last day of the year can't be in the first week of that
> year.

According to ISO 8601 it can.  See the official standard for the
authoritative details but wikipedia has a good summary.


Weeks begin with Monday and end on Sunday.  Week 01 is the week with
the year's first Thursday in it.

The GNU Coreutils date %V documentation says:

       week number of year with Monday as first day of the week as a
       decimal (`01'...`53').  If the week containing January 1 has four
       or more days in the new year, then it is considered week 1;
       otherwise, it is week 53 of the previous year, and the next week
       is week 1.  (See the ISO 8601 standard.)

Perhaps for your purposes (you didn't say what you purpose was) you
wanted to use %G%V?

  $ date -d 2008-12-31 +%G%V

Personally I prefer %F (a GNU extension) best.

  $ date -d 2008-12-31 +%F


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