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_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"