user: Question: What date was the Colonial Stadium?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Ground', 'Date', 'Crowd']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Adelaide', '10.13 (73)', 'Brisbane Lions', '16.18 (114)', 'Westpac Stadium', 'Saturday, 17 February', 8000.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Ground" = 'Colonial Stadium';