gistfile1.txt

var calculateElapsedTime = function (startTime, endTime) {
  var milliseconds = endTime - startTime;
  
  var seconds = Math.round(milliseconds / 1000);
  var minutes = Math.floor(seconds / 60);
  var hours =  minutes > 59 ? Math.floor(minutes / 60) : 0;

  if (minutes > 0) {
    seconds -= minutes * 60;
  }

  if (minutes > 59) {
    minutes -= hours * 60;
  }

  return {
    hours: hours,
    minutes: minutes,
    seconds: seconds
  };
};