How can I make a X day trial Program

Hi to u all
I am developing a Desktop application and want to sell after developement, but i want to make a programm like timer in an applicatio that it expire after 15 day or so and i can then able to unlock the programm by giving them a key or some thing.
Any idea ?
Please Help...
Kind Regards
Gugi

Write a date/time value to the registy and then reference it each time you start up or write it to a configuration file and save parity of the file so you have a chance of telling if it has been altered.

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