title: Show only hours and minutes without date
body: <p>I have a column that shows the date and time (DD/MM/YY HH:mm) but I just need hours and minutes.</p>
  <p>I have tried the short way of concatenation:</p>
  <p>concat(date_part('hour', start_time),':',date_part('minute', start_time)) AS &quot;Start time&quot;</p>
  <p>but I get only one number in the minutes, without 0 such as &quot;21.3&quot; instead of &quot;21.30&quot;</p>
  <p>Do you have any suggestions?</p>
  <p>Thank you.</p>