// For a internationalised version
// see: http://snipplr.com/view/7196/kill-app-after-expire-date-suicidal-code-redux/

// Two-week expiration
#define EXPIREAFTERDAYS 14

#if EXPIREAFTERDAYS
   // Idea from Brian Cooke.
   NSString* nowString =
      [NSString stringWithUTF8String:__DATE__];
   NSCalendarDate* nowDate =
      [NSCalendarDate dateWithNaturalLanguageString:nowString];
   NSCalendarDate* expireDate =
      [nowDate addTimeInterval:(60*60*24* EXPIREAFTERDAYS)];

   if ([expireDate earlierDate:[NSDate date]] == expireDate)
   {
      // Run an alert or whatever

      // Quit!
      [NSApp terminate:self];
   }
#endif

// Two-week expiration
#define EXPIREAFTERDAYS 14

#if EXPIREAFTERDAYS
   // Idea from Brian Cooke.
   NSString* nowString =
      [NSString stringWithUTF8String:__DATE__];
   NSCalendarDate* nowDate =
      [NSCalendarDate dateWithNaturalLanguageString:nowString];
   NSCalendarDate* expireDate =
      [nowDate addTimeInterval:(60*60*24* EXPIREAFTERDAYS)];

   if ([expireDate earlierDate:[NSDate date]] == expireDate)
   {
      // Run an alert or whatever

      // Quit!
      [NSApp terminate:self];
   }
#endif

http://www.red-sweater.com/blog/371/suicidal-code

Using a gcc predefined macro, __DATE__, the code can know for itself when it was compiled, and build in an expiration date based on that value.

For a internationalised version see: http://snipplr.com/view/7196/kill-app-after-expire-date-suicidal-code-redux/

kill app after expire date

osx

Objective C