What is the date of the race at Truro?
CREATE TABLE "racelines" (
  "date" text,
  "track" text,
  "race" text,
  "purse" text,
  "finish" text,
  "time" text,
  "last_1_4" real,
  "odds" text,
  "driver" text,
  "trainer" text
);
SELECT "date" FROM "racelines" WHERE "track"='truro';