What date has Liga 3rd of Dynamo Dresden?
CREATE TABLE "3rd_liga_promotion_round" (
  "date" text,
  "2nd_bundesliga_16th" text,
  "3rd_liga_3rd" text,
  "game_1" text,
  "game_2" text
);
SELECT "date" FROM "3rd_liga_promotion_round" WHERE "3rd_liga_3rd"='dynamo dresden';