What date has a Position of back, later than 1964, and a Test debut of 1st rl test v new zealand?
CREATE TABLE "australia" (
  "player" text,
  "test_debut" text,
  "year" real,
  "cross_code_debut" text,
  "date" text,
  "position" text
);
SELECT "date" FROM "australia" WHERE "position"='back' AND "year">1964 AND "test_debut"='1st rl test v new zealand';