When michele pirro is the pole position what is the date?
CREATE TABLE table_21191496_1 (date VARCHAR, pole_position VARCHAR)
SELECT date FROM table_21191496_1 WHERE pole_position = "Michele Pirro"
### Context: CREATE TABLE table_21191496_1 (date VARCHAR, pole_position VARCHAR) ### Question: When michele pirro is the pole position what is the date? ### Answer: SELECT date FROM table_21191496_1 WHERE pole_position = "Michele Pirro"