What date is the 1:00 pm game at arrowhead stadium?
CREATE TABLE "regular_season_schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "time_et" text,
  "game_site" text,
  "final_score" text
);
SELECT "date" FROM "regular_season_schedule" WHERE "time_et"='1:00 pm' AND "game_site"='arrowhead stadium';