CREATE TABLE table_47932 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score" TEXT)

What day was the surface clay and the score 6 1, 6 4?
SELECT "Date" FROM table_47932 WHERE "Surface" = 'clay' AND "Score" = '6–1, 6–4'
SELECT "Date" FROM "table_47932" WHERE "Score" = '6–1, 6–4' AND "Surface" = 'clay'