user: Question: What was the average date with a record of 30-31-9 in a game over 70?
Columns: ['Game', 'Date', 'Opponent', 'Score', 'Location/attendance', 'Record']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [61.0, 2.0, 'Toronto Maple Leafs', '2-5', 'Toronto', '26-29-6']
SQL:

assistant: SELECT AVG("Date") FROM "Table" WHERE "Record" = '30-31-9' AND "Game" > 70.0;