title: Get End Time from Start Time and Duration
body: <p>I have start time in format hh:mm:ss and then entering duration in hours and selecting a day of week.</p>
  
  <p>I want to calculate the end time based on above parameters.</p>
  
  <p>For Example: of start time is 00:00:00 and duartion entered is 48 hours with day of week as Sunday. The end time must be 00:00:00 hrs on Tuesday.</p>
  
  <p>How to do it?</p>