On what date is there a match lower than 14 with a ground of H and the opponent Aston Villa under 18s?
CREATE TABLE "stats" (
  "match" real,
  "date" text,
  "competition_or_tour" text,
  "ground" text,
  "opponent" text,
  "score1" text
);
SELECT "date" FROM "stats" WHERE "match"<14 AND "ground"='h' AND "opponent"='aston villa under 18s';