What is the date of the game with pittsburgh as the home team and boston as the visitor team?
CREATE TABLE "final_standings" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "record" text,
  "points" real
);
SELECT "date" FROM "final_standings" WHERE "home"='pittsburgh' AND "visitor"='boston';