From mboxrd@z Thu Jan  1 00:00:00 1970
From: Georges Ko <gko@gko.net>
Subject: Re: Convert from date to week number, howto?
Date: Fri, 03 Feb 2012 23:58:48 +0800
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Jambunathan K <kjambunathan@gmail.com> writes:

>> I sometimes have to convert from a date to a week number, 
>
> Try this. 
>
> (org-odt-format-date "<2011-12-31 Sat>" "%U")
> (org-odt-format-date "[2011-12-24 Sat]" "%U")
>
> You can steal the implementation. The functions have nothing to do with
> org-odt, btw.

Another way to get the week of the year is:

(require 'calendar)
(require 'cal-iso)

(car
  (calendar-iso-from-absolute
    (calendar-absolute-from-gregorian 
      (list month day year))))
-- 
 Georges Ko                     gko@gko.net                      2012-02-03