Hi Tracy!
Just add a button to the form that adds or subtracts a big number to the date field. You can play around with the number. Then, clicking on the button will jump the date forward or back. I'd start with a year but I forget if the units are days or something smaller. Anyway, you'll be taking 365 times something. :) Good luck.
Patrick Halstead [InfoPath MVP]
InfoPathDev
Patrick Halstead
Project Manager at Qdabra