Javascript Date toJSON(key)

Date.prototype.toJSON = function (key) {
   function f(n) {
      // Format integers to have at least two digits.
      return n < 10 ? '0' + n : n;
   }/*from   www .j  av a2 s .com*/

   return this.getUTCFullYear()   + '-' +
      f(this.getUTCMonth() + 1) + '-' +
      f(this.getUTCDate())      + 'T' +
      f(this.getUTCHours())     + ':' +
      f(this.getUTCMinutes())   + ':' +
      f(this.getUTCSeconds())   + 'Z';
};