CREATE TABLE table_1507 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB, "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'