title: Days difference between two dates
body: <p>I've been trying many ways to calculate the round number of days between two dates, I mean, counting the whole days. An example of what I need:</p>
  
  <pre><code>   START DATE            END DATE          Day Count  
  
  24/02/2010 16:26     24/02/2010 16:26         1  
  20/02/2010 18:16     24/02/2010 16:26         5  
  31/12/2009 20:00     24/02/2010 16:26         56  
  15/07/2009 20:59     24/02/2010 16:26         225  
  </code></pre>