docs: def rfcformat(dt, localtime=False):
      """Return the RFC822-formatted representation of a datetime object.
  
      :param datetime dt: The datetime.
      :param bool localtime: If ``True``, return the date relative to the local
          timezone instead of UTC, displaying the proper offset,
          e.g. "Sun, 10 Nov 2013 08:23:45 -0600"
      """
      if not localtime:
          return formatdate(timegm(dt.utctimetuple()))
      else:
          return local_rfcformat(dt)