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_1140090_6 (date VARCHAR, winning_driver VARCHAR)
### Question:
What was the date when Chris Amon won?
### Answer:
SELECT date FROM table_1140090_6 WHERE winning_driver = "Chris Amon"