user: Question: On what Date is the Minnesota Vikings the Opponent?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'August 5, 1972', 'at Detroit Lions', 'L 23-31', '0–1']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Minnesota Vikings';