var clone = require("clone");

var today = new Date();
var todayCloned = clone(today);

var console = require("jquery")("<pre/>").appendTo('body');
console.append
	( "Is todayCloned is an instance of Date? – "
  + (todayCloned instanceof Date ? "Yup!" : "Nope.")
  + "\n"
  );

Date.prototype.justInserted = "This has just been inserted to Date's prototype."
console.append(todayCloned.justInserted + "\n");