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copied!<p>The <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getTime" rel="noreferrer"><code>Date.prototype.getTime</code></a> method returns the number of milliseconds since the epoch (1970-01-01T00:00:00Z); it is unique to the Date type and an important method.</p> <p>The <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf" rel="noreferrer"><code>Object.prototype.valueOf</code> method</a> is used to get the "primitive value" of any object. For the Date class, it is convenient to use the "time" attribute (the value returned by <code>getTime()</code>) as its primitive form since it is a common representation for dates. Moreover, it lets you use arithmetic operators on date objects so you can compare them simply by using comparison operators (<code><</code>, <code><=</code>, <code>></code>, etc).</p> <pre class="lang-javascript prettyprint-override"><code>var d = new Date(); d.getTime(); // => 1331759119227 d.valueOf(); // => 1331759119227 +d; // => 1331759119227 (implicitly calls "valueOf") var d2 = new Date(); (d < d2); // => true (d came before d2) </code></pre> <p>Note that you could implement the "valueOf" method for your own types to do interesting things:</p> <pre class="lang-javascript prettyprint-override"><code>function Person(name, age) {this.name=name; this.age=age;} Person.prototype.valueOf = function() {return this.age; } var youngster = new Person('Jimmy', 12); var oldtimer = new Person('Hank', 73); (youngster < oldtimer); // => true youngster + oldtimer; // => 85 </code></pre>

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