On what date did Gunnar Nilsson make the fastest lap?
CREATE TABLE table_name_38 (
    date VARCHAR,
    fastest_lap VARCHAR
)
SELECT date FROM table_name_38 WHERE fastest_lap = "gunnar nilsson"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: On what date did Gunnar Nilsson make the fastest lap? ### Input: CREATE TABLE table_name_38 (
    date VARCHAR,
    fastest_lap VARCHAR
) ### Response: SELECT date FROM table_name_38 WHERE fastest_lap = "gunnar nilsson"