CREATE TABLE table_56158 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents in the final" TEXT, "Score" TEXT)

Which date has a Score of 6 4, 6 3?
SELECT "Date" FROM table_56158 WHERE "Score" = '6–4, 6–3'
SELECT "Date" FROM "table_56158" WHERE "Score" = '6–4, 6–3'