On what date was the game played when the Western Bulldogs were in 8th ladder position and hawthorn was the opposing team?
CREATE TABLE "nab_cup_and_premiership_season_results" (
  "round" text,
  "opposition" text,
  "time" text,
  "date" text,
  "home_away" text,
  "venue" text,
  "score" text,
  "result_margin" text,
  "broadcaster" text,
  "tv" text,
  "ladder_position" text
);
SELECT "date" FROM "nab_cup_and_premiership_season_results" WHERE "ladder_position"='8th' AND "opposition"='Hawthorn';