user: Question: Tell me the date with result of L 13–9
Columns: ['Week', 'Date', 'TV Time', 'Opponent', 'Result']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 12, 1999', 'FOX 1:00 et', 'at Washington Redskins', 'W 41–35']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Result" = 'L 13–9';