Get the number of milliseconds since some date
<p>How to get the number of milliseconds from October 15th 2011 1:52:34 P.M.</p>

<p>I can get the number of milliseconds from the current time.</p>

<pre><code>Date date = new Date();
        long currentTime = date.getTime();
        System.out.println("Current time in long: " + currentTime);
</code></pre>
