user: Question: On what date was the game played where the opponent was Stanford, ranked #5?
Columns: ['Date', 'Time', 'Opponent#', 'Rank #', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['09/10/1988', '9:00pm', '9 Michigan', '13', 'W19-17', '59,075']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Rank #" = '5' AND "Opponent#" = 'Stanford';