CREATE TABLE table_31818 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Time  (  ET  ) " TEXT, "Game Site" TEXT, "Final Score" TEXT)

What date is the 1:00 pm game at arrowhead stadium?
SELECT "Date" FROM table_31818 WHERE "Time ( ET )" = '1:00 pm' AND "Game Site" = 'arrowhead stadium'
SELECT "Date" FROM "table_31818" WHERE "Game Site" = 'arrowhead stadium' AND "Time ( ET )" = '1:00 pm'