public static String formatTimeDiff(long finishTime,long startTime){
  long timeDiff=finishTime - startTime;
  return formatTime(timeDiff);
}

public static String formatTimeDiff ( long finishTime , long startTime ) { long timeDiff = finishTime - startTime ; return formatTime ( timeDiff ) ; }
given a finish and start time in long milliseconds , returns a string in the format xhrs , ymins , z sec , for the time difference between two times . if finish time comes before start time then negative valeus of x , y and z wil return .
