title: Getting timezone from dateutil.parser.parse in Python
body: <p>Trying to parse the datetime string with timezone info and get the utc offset</p>
  
  <pre><code>from dateutil.parser import parse as parse_date
  s = '2017-08-28 06:08:20,488 CDT'
  dt = parse_date(s)
  print(dt.utcoffset())  # prints `None`
  </code></pre>
  
  <p>Why is utcoffset returning <code>None</code> rather than <code>-5</code> as offset?</p>