def extract(header):
    """Extract date and time from a fixed-format packet header.

    Header format (always exactly this shape):
      TIMESTAMP=YYYY-MM-DDTHH:MM:SSZ
    Length 30. Example:
      TIMESTAMP=2026-05-04T14:32:01Z

    Return a tuple (date, time) where:
      date = "YYYY-MM-DD"  (10 chars)
      time = "HH:MM:SS"    (8 chars)

    extract("TIMESTAMP=2026-05-04T14:32:01Z")
      -> ("2026-05-04", "14:32:01")
    """
    pass