How to get hh:mm:ss difference using milliseconds in javascript?

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function getTimeDifference(startTimestamp, endTimestamp) {
  var startTime = new Date(startTimestamp).getTime();
  var endTime = new Date(endTimestamp).getTime();
  
  var diff = endTime - startTime;
  
  // Calculate hours, minutes, and seconds
  var hours = Math.floor(diff / (1000 * 60 * 60));
  var minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
  var seconds = Math.floor((diff % (1000 * 60)) / 1000);
  
  // Format the time difference
  var timeDiff = hours.toString().padStart(2, '0') + ":" + 
                 minutes.toString().padStart(2, '0') + ":" +
                 seconds.toString().padStart(2, '0');
                 
  return timeDiff;
}

// Example usage
var start = "2022-01-01T10:00:00";
var end = "2022-01-01T12:30:45";
var difference = getTimeDifference(start, end);
console.log(difference); // Output: 02:30:45