title: NSDate with date component from one and time component from another NSDate
body: <p>I have two UIDatePicker controls in my app, one configured with UIDatePickerModeDate and one with UIDatePickerModeTime. </p>
  
  <p>I want to configure a NSDate object with the date from UIDatePicker one and the time from the second one ... how? </p>
  
  <p>Thanks,
  Mark</p>