When was the date of appointment for St. Johnstone's manager?
CREATE TABLE table_16075179_6 (
    date_of_appointment VARCHAR,
    team VARCHAR
)
SELECT date_of_appointment FROM table_16075179_6 WHERE team = "St. Johnstone"
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 was the date of appointment for St. Johnstone's manager? ### Input: CREATE TABLE table_16075179_6 (
    date_of_appointment VARCHAR,
    team VARCHAR
) ### Response: SELECT date_of_appointment FROM table_16075179_6 WHERE team = "St. Johnstone"