Which broadcast date has 6.8 million viewers?
CREATE TABLE table_24179 (
    "Episode" text,
    "Broadcast date" text,
    "Run time" text,
    "Viewers (in millions)" text,
    "Archive" text
)
SELECT "Broadcast date" FROM table_24179 WHERE "Viewers (in millions)" = '6.8'
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: Which broadcast date has 6.8 million viewers? ### Input: CREATE TABLE table_24179 (
    "Episode" text,
    "Broadcast date" text,
    "Run time" text,
    "Viewers (in millions)" text,
    "Archive" text
) ### Response: SELECT "Broadcast date" FROM table_24179 WHERE "Viewers (in millions)" = '6.8'