Implementing Expiration Dates in an application?

Question

I\'d like to put an expiration date in some software I made. Obviously

psuedocode:

if time() > xxx: exit()

All someone has to do he

Answer 1

What is your goal here? If it's to stop all theft, good luck with that; all protection schemes will be broken eventually. If it's to keep the honest people honest, don't worry about them setting the clock back - it's enough of a hassle that nobody will do it, and those honest folk will pay up immediately.