Date: Format JavaScript date to MM/DD/YYYY

date.toMMDDYYYY

Date.prototype.toMMDDYYYY = function (key) {
  function f(n) {
    // Format integers to have at least two digits.
    return n < 10 ? '0' + n : n;
  }
  return  f(this.getUTCMonth() + 1) + '/' +
          f(this.getUTCDate())      + '/' +
          this.getUTCFullYear();
};