CREATE TABLE table_31538 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partnering" TEXT, "Opponent in the final" TEXT, "Score" TEXT)

Tell me the date for nicolas pereira
SELECT "Date" FROM table_31538 WHERE "Partnering" = 'nicolas pereira'
SELECT "Date" FROM "table_31538" WHERE "Partnering" = 'nicolas pereira'