On what Date in Stade Leopold Senghor, Dakar was the Score 4–0?
CREATE TABLE "international_goals" (
  "date" text,
  "venue" text,
  "score" text,
  "result" text,
  "competition" text
);
SELECT "date" FROM "international_goals" WHERE "score"='4–0' AND "venue"='stade leopold senghor, dakar';