user: Question: Can you tell me the Date that has the Week smaller than 13, and the Opponent of Green Bay Packers?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 17, 1967', 'New York Giants', 'L 37-20', 40801.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Week" < 13.0 AND "Opponent" = 'Green Bay Packers';