user: Question: What day 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: ['Fitzroy', '13.14 (92)', 'Richmond', '12.16 (88)', 'Junction Oval', 12997.0, '9 May 1981']
SQL:

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