What is the date for the tournament McDonald's wpga championship?
CREATE TABLE "ladies_european_tour_wins_6" (
  "no" real,
  "date" text,
  "tournament" text,
  "winning_score" text,
  "to_par" text,
  "margin_of_victory" text,
  "runner_s_up" text,
  "winners_share" real
);
SELECT "date" FROM "ladies_european_tour_wins_6" WHERE "tournament"='McDonald''s WPGA Championship';