CREATE TABLE table_4947 ("Date" TEXT, "Tournament" TEXT, "Location" TEXT, "Winner" TEXT, "Score" TEXT, "Winner's share  (  $  ) " TEXT)

What date was the tournament that had a winner's share of $28,000?
SELECT "Date" FROM table_4947 WHERE "Winner's share ( $ )" = '28,000'
SELECT "Date" FROM "table_4947" WHERE "Winner's share ( $ )" = '28,000'