title: How to subtract date and time in Pandas?
body: <p>I have data from Pandas which was the contents of a CSV file:</p>
  
  <pre><code>Date                Inbound     Outbound
  17/10/2019 12:35    5.49E+02    3.95E+03 
  17/10/2019 12:40    2.06E+02    3.17E+03 
  17/10/2019 12:45    2.06E+02    3.17E+03 
  17/10/2019 12:50    2.06E+02    3.17E+03 
  17/10/2019 12:55    2.06E+02    3.17E+03 
  17/10/2019 13:00    2.06E+02    3.17E+03
  ....
  </code></pre>
  
  <p>I aim to convert the column <code>Date</code> from timestamps to time periods in units of minutes, which should result in something like the following:</p>
  
  <pre><code>    Date        Inbound     Outbound
      0           5.49E+02    3.95E+03 
      5           2.06E+02    3.17E+03 
      10          2.06E+02    3.17E+03 
      15          2.06E+02    3.17E+03 
      20          2.06E+02    3.17E+03 
      25          2.06E+02    3.17E+03
  </code></pre>