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_91 (date VARCHAR, winning_driver VARCHAR, race_name VARCHAR)
### Question:
What is the date that the winner driver is Stirling Moss in the race named vi grand prix de caen?
### Answer:
SELECT date FROM table_name_91 WHERE winning_driver = "stirling moss" AND race_name = "vi grand prix de caen"