user: Question: What is the date when Canada played?
Columns: ['Sixes', 'Player', 'Opponent', 'Venue', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['8', 'Imran Nazir', 'Zimbabwe', 'Kingston', '21-03-2007']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Canada';