user: Question: What date did the Ravens play the Buffalo Bills?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 12, 1999', 'at St. Louis Rams', 'L 27–10', '0–1–0', '62,100']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Buffalo Bills';