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_21 (date VARCHAR, home VARCHAR, visitor VARCHAR)
### Question:
What is the date of the match when Detroit is the home team and Colorado is the visiting team?
### Answer:
SELECT date FROM table_name_21 WHERE home = "detroit" AND visitor = "colorado"