user: Question: Which Date has a Result of W 13–6?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, '1971-09-19', 'at Baltimore Colts', 'L 22–0', 'Memorial Stadium', 56458.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Result" = 'W 13–6';