user: Question: Which date featured the Boston Patriots as the opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Game site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '1961-09-09', 'at Boston Patriots', 'W 21–20', 'Nickerson Field', '16,684']
SQL:

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