Is there a way to calculate a time stamp for the next coming up of a week day?

So for instance, with friday, i'd like to be able to run some code that calculates that from today Wednesday 19/05/10, the next friday will be 21/05/10 and get a time stamp from it.

I know the date command can parse a given string date according to a format, but I can't figure out how to calculate "next friday from today"

Any idea?

EDIT: I'm on a mac

bash date
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