title: php date_diff issue. getting blank result
body: <p>I am running php 5.3.5 on my local wamp setup. I am running a simple code.</p>
  
  <pre><code>echo "&lt;br/&gt;DEBUGGING";
  echo "&lt;br/&gt;===========";
  echo "&lt;br/&gt;Date: ".$date;
  echo "&lt;br/&gt;Lead Days: ".$lead_days;
  echo "&lt;br/&gt;Date diff: ".var_dump(date_diff((int)$date, (int)$lead_days))." difference";
  </code></pre>
  
  <p>But the output is:</p>
  
  <pre><code>DEBUGGING
  ===========
  Date: 2012-08-31
  Lead Days: 2012-09-05
  
  boolean false
  
  
  Date diff: difference
  </code></pre>
  
  <p>date_diff seems to return false. I have tried it without var_dump and without int casting, but it always comes blank, however it works if I upload to my webserver. Any ideas what is wrong here? </p>