user: Question: What date was the game when 40,000 attended?
Columns: ['Date', 'Opponent#', 'Rank #', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['September 26', 'Fort Knox Army squad', '1', 'Ohio Stadium • Columbus, OH', 'W59-0', '22,555']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Attendance" = '40,000';