title: Python custom datetime(?) format handling
body: <p>Let's say i have a string representing a time with number of day of the week:</p>
  
  <p>For example '52300', which means 5th day of week(Friday), 23 Hours 00 Minutes.</p>
  
  <p>How do i parse it to time or datetime object to add a timedelta(hours=3) and get it back to this strange format? Expected output is '60200' string.</p>
  
  <p>I have tried:</p>
  
  <pre><code>tow_str = '52300'
  tow = datetime.datetime.strptime(tow_str, "%w%H%M") + datetime.timedelta(hours=3)
  print(tow.strftime("%w%H%M"))
  </code></pre>
  
  <p>which returns '20200' instead of '60200'</p>