user: Question: On what date did the Bills play the Houston Oilers before week 12?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 13', 'Kansas City Chiefs', 'W 34–17', '30,157']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Week" < 12.0 AND "Opponent" = 'Houston Oilers';