Javascript Date getTimestamp()

function fixNumber(number, scale) {
 if (typeof(scale) === 'undefined') {
  scale = 2;// ww w .j  av  a  2s .  c o  m
 }

 var n = number;
 var str = '';

 for (var i=scale; i>=1; i--) {
  var p = Math.pow(10, i-1);

  if (n >= p) {
   str += Math.floor(n / p);
  } else {
   str += '0';
  }

  n = n % p;
 }

 return str;
}

Date.prototype.getTimestamp = function() {
  var timestamp = this.getFullYear() + '-' + fixNumber(this.getMonth() + 1) + '-' + fixNumber(this.getDate());
  timestamp += ' ' + this.toTimeString().substring(0, 8);

  return timestamp;
};