title: Calculate time difference between two dates (DD/MM/YYY HH/MM)
body: <p>In Excel, I have these kind of fields (in the second and the third column):</p>
  
  <pre><code>Fecha/Hora inicio   Fecha/Hora finalización
  02/01/2017 21:32    03/01/2017 6:02
  02/01/2017 6:02     03/01/2017 7:32
  03/01/2017 7:38     04/01/2017 13:47
  </code></pre>
  
  <p>I want to know the time difference between the first and the second field in hours. For instance, in the second case, the difference is 25.5 hours. </p>
  
  <p>I was trying to calculate it manually but I'm sure there is an automatic way.</p>