title: Checking if date is in UTC format
body: <p>Im using the pytz module to translate a date in America/Los_Angeles timezone to utc by the code below :</p>
  
  <pre><code>TZ = 'America/Los_Angeles'
  from = pytz.timezone(TZ)
  utc = from.localize(original_date).astimezone(pytz.utc)
  </code></pre>
  
  <p>Now,i want to test if utc value is actually in UTC format or not. How to do that with pytz or datetime ?</p>
  
  <p>Please Help
  Thank You</p>