How to determine which date is on friday?

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Published on 2010-04-06T12:02:58Z Indexed on 2010/04/06 12:03 UTC
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I have two dropdownlists - one for year and one for weeks. How to determine the chosen weeks date should be the friday. So for example I chose week 34 and year 2011 then I should know the date on friday, in format like this: 2011-08-23. And preferably in javascript too.

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