code: public String toMMSS(String delimiter) {
      String outString = "";
      int _minutes = getHours() * 60;
      _minutes += getMinutes();
      outString += (_minutes < 10 ? "0" + _minutes : "" + _minutes) + delimiter;
      outString += (getSeconds() < 10 ? "0" + getSeconds() : "" + getSeconds());
      return outString;
    }
docs: Hours are added to the minutes value so minutes could be larger than 60. Units smaller than
  seconds are ignored completely. For example the HH:MM:SS:FF string "01:03:05:07" would return
  "63:05"
  
  @param delimiter
  @return the total time in mm:ss format where ":" is specified by the delimiter parameter.