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copied!<h1>Short & Snazzy:</h1> <pre><code>+ new Date() </code></pre> <p>A unary operator like <code>plus</code> triggers the <code>valueOf</code> method in the <code>Date</code> object and it returns the timestamp (without any alteration).</p> <p><strong>Details:</strong></p> <p>On almost all current browsers you can use <a href="http://www.ecma-international.org/ecma-262/5.1/#sec-15.9.4.4" rel="noreferrer"><code>Date.now()</code></a> to get the UTC timestamp in <strong>milliseconds</strong>; a notable exception to this is IE8 and earlier (see <a href="http://kangax.github.io/compat-table/es5/#Date.now" rel="noreferrer">compatibility table</a>).</p> <p>You can easily make a shim for this, though:</p> <pre><code>if (!Date.now) { Date.now = function() { return new Date().getTime(); } } </code></pre> <p>To get the timestamp in <strong>seconds</strong>, you can use:</p> <pre><code>Math.floor(Date.now() / 1000) </code></pre> <p>Or alternatively you could use:</p> <pre><code>Date.now() / 1000 | 0 </code></pre> <p>Which should be slightly faster, but also less readable (also <a href="https://stackoverflow.com/questions/7487977/using-bitwise-or-0-to-floor-a-number">see this answer</a>).</p> <p>I would recommend using <code>Date.now()</code> (with compatibility shim). It's slightly better because it's shorter & doesn't create a new <code>Date</code> object. However, if you don't want a shim & maximum compatibility, you could use the "old" method to get the timestamp in <strong>milliseconds</strong>:</p> <pre><code>new Date().getTime() </code></pre> <p>Which you can then convert to seconds like this:</p> <pre><code>Math.round(new Date().getTime()/1000) </code></pre> <p>And you can also use the <code>valueOf</code> method which we showed above:</p> <pre><code>new Date().valueOf() </code></pre> <p><strong>Timestamp in Milliseconds</strong></p> <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false"> <div class="snippet-code"> <pre class="snippet-code-js lang-js prettyprint-override"><code>var timeStampInMs = window.performance && window.performance.now && window.performance.timing && window.performance.timing.navigationStart ? window.performance.now() + window.performance.timing.navigationStart : Date.now(); console.log(timeStampInMs, Date.now());</code></pre> </div> </div> </p>

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