CREATE TABLE table_1142 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Record" TEXT, "Game Site" TEXT, "Attendance" FLOAT)

what's the date with attendance being 40657
SELECT "Date" FROM table_1142 WHERE "Attendance" = '40657'
SELECT "Date" FROM "table_1142" WHERE "Attendance" = '40657'