user: Question: When was the result 3-1?
Columns: ['Date', 'Venue', 'Result', 'Win/ Loss/ Draw', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['2 March 2013', 'New Laos National Stadium , Vientiane', '1–0', 'W', '2014 AFC Challenge Cup qualification']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Result" = '3-1';