user: Question: What was the date of the game played at Gillette Stadium with a score of 40-21?
Columns: ['Year', 'Date', 'Winner', 'Result', 'Loser', 'Location']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2000.0, 'October 8', 'New England Patriots', '24-16', 'Indianapolis Colts', 'Foxboro Stadium']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Location" = 'Gillette Stadium' AND "Result" = '40-21';