title: Xcode How to calculate the number of month between two dates
body: <p>I would like to calculate the amount of month since the last time an app has been started.</p>
  
  <p>To do this, I save the current date at <code>viewdidload</code> to <code>NSUserdefaults</code> as String.</p>
  
  <p>Before I save the current date, I have to calculate the difference in month between the old(saved) date and the current date.</p>
  
  <p>I am new in programming with NSDates, can someone tell me how to do this? And how to print the count in a lable?</p>
  
  <p>Hope you understand what I mean and also someone could help me...</p>
  
  <p>regards Dennis</p>