Implementing application expiration dates?

Question

I would like to indicate the expiration date in some kind of software that I made. Obviously

psuedocode:

if time() > xxx: exit()

All you need to do is set the system clock back. Is there anything better to do?

Answer 1

What would be more convenient for the user to track the number of days the user has used your software. For example, every time your program starts, you can write the date to an encrypted file (if the date no longer exists in the file). Then, when the file has more than, say, 30 dates, tell the user that it is time to buy the full version.

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