Find the difference between two dates using PHP?
<p>I have two dates of the form:</p>

<pre><code>Start Date: 2013-05-19 
End Date: 2013-05-21
</code></pre>

<p>Now I need to find the difference between these two in the following form:</p>

<pre><code>2013-05-20
2013-05-21
</code></pre>

<p>How can I do this in PHP?</p>
