Anybody have a week ending date helper?

Can you make any of the built-in date helpers produce a week ending
combo box? I don't want drop down boxes, just one. With the options
being every Friday for the last x number of weeks in the format mm/dd/
yyyy. That should be saved into a datetime column in the database.

Before writing it myself, it just seemed like a common enough need I'm
surprised it's not already in there. (or it's hard to find)

Regards,
Ryan

Ooop, that should read "I don't want multiple drop down boxes, just
one."