user: Question: Which date  has a Week smaller than 14, and an Opponent of San Francisco 49ers?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'August 31, 1997', 'at St. Louis Rams', 'L 38-24', '64,575']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Week" < 14.0 AND "Opponent" = 'San Francisco 49ers';