[AccessD] is this date affected?

I was wondering if anyone already has some code or Jet SQL to determine if a
date is affected?

Such as  Every other Saturday for the next x Saturdays starting 4/16/2011
(2011.04.16 ;)  )

Is 4/30/2011 one of those saturdays?  (Yes)
Is May 7th? (no)

I was going to write a function, but I was wondering I am re-inventing the
wheel, or if there is some built in too to do so.


Thanks,
David