user: Question: What date did Collingwood play as the home team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '19.7 (121)', 'St Kilda', '18.16 (124)', 'Arden Street Oval', 12599.0, '8 July 1978']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Home team" = 'Collingwood';