docs: def parse_raw(s, lineno=0):
      """Parse a date from a raw string.
  
      The format must be exactly "seconds-since-epoch offset-utc".
      See the spec for details.
      """
      timestamp_str, timezone_str = s.split(b' ', 1)
      timestamp = float(timestamp_str)
      try:
          timezone = parse_tz(timezone_str)
      except ValueError:
          raise errors.InvalidTimezone(lineno, timezone_str)
      return timestamp, timezone