title: NSDateformatter added in Interface Builder on NSTextfield adds GMT difference
body: <p>OK, I want to build a countdown timer with a <code>NSTextfield</code> and a <code>NSStepper</code> to increase it. 
  Both have bindings to the same int property in <code>ModelKeyPath</code> in Interface <code>Builder</code>. To format the int value output to 00:00:00, I added a <code>NSDateFormatter</code> in <code>IB</code> to the <code>NSTextfield</code>.</p>
  
  <p>It's working, but when I run the application, the difference to GMT in my case +001 is added.
  The int value should be 0, but the textField shows 01:00:00</p>
  
  <pre><code>- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
  {
      // Insert code here to initialize your application
      self.countdownTimer = [[Timer alloc] init];
  
      [self.countdownTimer setTimerCount:0];
  }
  </code></pre>
  
  <p>I've done it programatically with this solution: <a href="https://stackoverflow.com/questions/1739383/convert-seconds-integer-to-hhmm-iphone">Convert Seconds Integer To HH:MM, iPhone</a>
  but i want to use the <code>NSDateFormatter</code>. Help appreciated.</p>