When did the episode seen by is 2.267 million people get aired?
CREATE TABLE table_21055055_2 (
    au_air_date VARCHAR,
    viewers__m_ VARCHAR
)
SELECT au_air_date FROM table_21055055_2 WHERE viewers__m_ = "2.267"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: When did the episode seen by is 2.267 million people get aired? ### Input: CREATE TABLE table_21055055_2 (
    au_air_date VARCHAR,
    viewers__m_ VARCHAR
) ### Response: SELECT au_air_date FROM table_21055055_2 WHERE viewers__m_ = "2.267"