What date was the surface hard and Eva Hrdinov was the opponent?
CREATE TABLE table_name_40 (
    date VARCHAR,
    surface VARCHAR,
    opponent VARCHAR
)
SELECT date FROM table_name_40 WHERE surface = "hard" AND opponent = "eva hrdinová"
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: What date was the surface hard and Eva Hrdinov was the opponent? ### Input: CREATE TABLE table_name_40 (
    date VARCHAR,
    surface VARCHAR,
    opponent VARCHAR
) ### Response: SELECT date FROM table_name_40 WHERE surface = "hard" AND opponent = "eva hrdinová"