title: Difference in days between two different date formats
body: <p>Just wondering how can I change different formats of dates and then calculate the number of days between the two.</p>
  
  <p>I have one date in the format </p>
  
  <pre><code> 2016-04-01 00:06:13:313
  </code></pre>
  
  <p>And another in the format</p>
  
  <pre><code> 06/05/2016  00:00:00
  </code></pre>
  
  <p>Just want to find out how many days are between the two dates.</p>
  
  <p>Many thanks</p>