On what date was the record 2–1?
CREATE TABLE "los_angeles_kings_4_edmonton_oilers_3" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "record" text
);
SELECT "date" FROM "los_angeles_kings_4_edmonton_oilers_3" WHERE "record"='2–1';