[OT] Any ideas for time-limiting demo web apps?

[bOOyah]

Very off-topic this one, but I'm wondering if anyone has any good 
techniques for preventing a web app from working beyond a certain time? 
 I'm thinking of the situation where demo or Beta versions of the app 
are distributed in the field and you want limit how long they will 
continue to work.

Obviously I could check the system clock and perform a crude 
calculation.  But how would I trap the system clock being reset back in 
time?

Are there lightweight alternative techniques?

TIA.
--
bOOyah
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