Expand RFC-2445 (iCalendar) recurrence rule?

[Roy Smith]

Does there exist a stand-alone module to expand RFC-2445 recurrence 
rule?  The idea is to start with a string like:

"RRULE:FREQ=WEEKLY;COUNT=6;INTERVAL=2;BYDAY=FR"

and derive a list of dates on which that event occurs.

I'm aware of http://codespeak.net/icalendar/, but that solves a much 
larger problem (parsing ics files) and I can't see how to tease out just 
this one function from that module.