What is the Date that has a Round of semifinal?
CREATE TABLE "svenska_cupen_2005" (
  "date" text,
  "venue" text,
  "opponents" text,
  "score" text,
  "round" text,
  "djurg_rden_scorers" text,
  "attendance" text
);
SELECT "date" FROM "svenska_cupen_2005" WHERE "round"='semifinal';