user: Question: When has a Result of L 27-7 and an Opponent of at Minnesota Vikings?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Venue', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 6, 1992', 'Minnesota Vikings', 'L 23-20 (OT)', 'Lambeau Field', '58,617']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Result" = 'L 27-7' AND "Opponent" = 'at Minnesota Vikings';