I would love something like this as well. I actually hacked the code
to do this. But it had an ill effect. A user could not manually
enter a year.
So today is 12/16, if you user enters 12/17 it shows up as 12/17/09,
but if they user enters 12/15 it shows up as 12/15/10. If the users
enters 12/15/09 it showed up as 12/15/10.
Haven't been able to figure it out.