title: Implementing Expiration Dates in an application?
body: <p>I'd like to put an expiration date in some software I made.  Obviously</p>
  
  <p>psuedocode:</p>
  
  <pre><code>if time() &gt; xxx: exit()
  </code></pre>
  
  <p>All someone has to do here is set their system clock back.  Anything better to do?</p>