[issue14423] Getting the starting date of iso week from a week number and a year.

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

Alexander Belopolsky wrote:
> 
> Alexander Belopolsky <alexander.belopolsky at 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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