Marc-Andre Lemburg <m...@egenix.com> added the comment:

Alexander Belopolsky wrote:
> 
> Alexander Belopolsky <alexander.belopol...@gmail.com> added the comment:
> 
> Before you invest in a C version, let's discuss whether this feature is 
> desirable.  The proposed function implements a very simple and not very 
> common calculation.  Note that even dateutil does not provide direct support 
> for this: you are instructed to use relativedelta to add weeks to January 1st 
> of the given year.

Which is wrong, since the start of the first ISO week of a year
can in fact start in the preceeding year...

http://en.wikipedia.org/wiki/ISO_week_date

and it's not a simple calculation.

ISO weeks are in common use throughout Europe, it's part of the
ISO 8601 standard. mxDateTime has had such constructors for ages:

http://www.egenix.com/products/python/mxBase/mxDateTime/doc/#_Toc293683820

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14423>
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