What was the date of the game when the Calgary Flames were the visiting team and there was a record of 1–2–0?
CREATE TABLE "game_log" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "record" text
);
SELECT "date" FROM "game_log" WHERE "visitor"='calgary flames' AND "record"='1–2–0';