Javascript Date toCustomFormat()

var prependZero = function(num) {
  return (num < 10)? ("0" + num) : num;
}

Date.prototype.toCustomFormat = function() {
  var h = this.getHours(),
      h_12hr = (h % 12),/* www. j a  v  a  2 s.c o m*/
      hh = prependZero((h_12hr == 0)? 12 : h_12hr),
      mm = prependZero(this.getMinutes()),
      ss = prependZero(this.getSeconds()),
      a  = (h >= 12)? "pm" : "am";
  return (this.toString("MMM dd, yyyy") + " " + hh + ":" + mm + ":" + ss + " " + a);
}