CREATE TABLE table_1507 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" FLOAT)

what date is the opponent is chicago bears?
SELECT "Date" FROM table_1507 WHERE "Opponent" = 'Chicago Bears'
SELECT "Date" FROM "table_1507" WHERE "Opponent" = 'Chicago Bears'