Date based licensing logic for Java web app?

I am trying to come up with a logic for a date based licensing mechanism for a Java web app. The app needs to be deployed in client sites which may not have access to the Internet (deployed on the intranet). In this case how do I build a licensing mechanism based on Start / End Dates. If I use the server system Date / Time for this, I risk the system admin changing the server date / time in order to keep the locense active. Any suggestions? Windows dektop apps seem to do this, not sure how? Sanjay.
"I risk the system admin changing the server date / time in order to keep the locense active." Also, when the license shuts down and the software stops working, you risk losing a customer forever. Which is worse, someone changing the date (and all the problems that creates for the admin) or someone never renewing because your license scheme is so complex?

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