CREATE TABLE table_18023 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB, "Attendance" FLOAT)

What was the date of the game against Kansas City Chiefs?
SELECT "Date" FROM table_18023 WHERE "Opponent" = 'Kansas City Chiefs'
SELECT "Date" FROM "table_18023" WHERE "Opponent" = 'Kansas City Chiefs'