Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_30 (date VARCHAR, ship_type VARCHAR, location VARCHAR)
### Question:
What date was a brig type ship located in SW Approaches?
### Answer:
SELECT date FROM table_name_30 WHERE ship_type = "brig" AND location = "sw approaches"