title: Cancelling local notification on specified date
body: <p>I have problem with even inventing the posible solution for this problem.</p>
  
  <p>My app needs to crate some objects of <code>UILocalNotification</code> with <code>interval</code> but if I set interval to be <code>NSMinuteCalendarUnit</code> if will bother me every minute until I cancel this notification in <code>UIApplication</code> or crash my phone with hammer...</p>
  
  <p>But I'm setting in my app an end date for my project and I want those notification to work only to a specified date. Someone told me to check it when the app launches (not a problem but <strong>what if I set this notification to be fired every minute and I won't close my app during this time?</strong>). I need something <strong>independent</strong> and I want to know how to do this.. Any ideas?</p>