docs: def dt_from_rfc8601(date_str):
      """Convert 8601 (ISO) date string to datetime object.
  
      Handles "Z" and milliseconds transparently.
  
      :param date_str: Date string.
      :type  date_str: ``string``
      :return: Date time.
      :rtype:  :class:`datetime.datetime`
      """
      # Normalize string and adjust for milliseconds. Note that Python 2.6+ has
      # ".%f" format, but we're going for Python 2.5, so truncate the portion.
      date_str = date_str.rstrip('Z').split('.')[0]
  
      # Format string. (2010-04-13T14:02:48.000Z)
      fmt = "%Y-%m-%dT%H:%M:%S"
      # Python 2.6+: Could format and handle milliseconds.
      # if date_str.find('.') >= 0:
      #    fmt += ".%f"
  
      return datetime.strptime(date_str, fmt)