title: Measuring time Interval Since Now
body: <p>anyone know or can provide some example code relating to "timeIntervalSinceNow" method...</p>
  
  <p>I need something like... time2(when app eneters foreground) - time1(when app enters background) = time3(the difference in times)... this is so i can use this number(pref in seconds) to calculate the time i have lost while the app has been in background !!</p>
  
  <p>I am having trying trying to create the date objects, receive the object and display/use in a label....</p>