seconds to time

function timeConverter(n) {
  var num = n;
  var hours = (num / 3600);
  var rhours = Math.floor(hours);
  var minutes = (hours - rhours) * 60;
  var rminutes = Math.round(minutes);
  var seconds = (minutes - rminutes) * 60;
  var rseconds = Math.round(seconds);
  return rhours + ":" + rminutes + ":" + rseconds;
}