I want my Javascript to expire in 30 days
<p>I'm looking for some code which can check whether 30 days have passed, and if so the script will stop working; if not, it calls the <code>start()</code> function.</p>

<p>I only need to do it in Javascript.</p>

<pre><code>var date = 11;
var month = 10;
var year = 2012;

function Checkday() {
    if ( // check 30 days ) {
        start();
    } else {
        stop();
    };
};
</code></pre>

<p>I'm also wondering whether there is a way to add PHP code in a JS file. I know this is a stupid question but I'm just curious.</p>

<p>Thanks in advance.</p>

<p><strong>Edited:</strong> </p>

<p>We will be selling the JS file so we will be setting the date in the JS file. So we want it to check the expiry time and stop functioning.</p>
