From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jambunathan K <kjambunathan@gmail.com>
Subject: Re: Convert from date to week number, howto?
Date: Thu, 02 Feb 2012 22:32:03 +0530
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> 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.

--