Date.prototype.shortFormat = function() {
  var day = this.getDate().toString();
  var month = (this.getMonth() + 1).toString();
  var year = this.getFullYear();
  if (day.length == 1) {
    day = "0" + day;
  }
  if (month.length == 1) {
    month = "0" + month;
  }
  var date = day + "/" + month + "/" + year;
  return (date);
}