user: Question: What day was the oppenent the Detroit Lions?
Columns: ['Week', 'Date', 'Opponent', 'Final score', 'Team record', 'Game site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 19', 'New York Giants', 'L 40–42', '0–1', 'Lambeau Field', 56263.0]
SQL:

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