CREATE TABLE table_69645 ("Tournament" CLOB, "Date" CLOB, "Surface" CLOB, "Round" CLOB, "Opponent" CLOB)

Name the date for grass surface for quarterfinal at the nsw building society open tournament
SELECT "Date" FROM table_69645 WHERE "Surface" = 'grass' AND "Round" = 'quarterfinal' AND "Tournament" = 'nsw building society open'
SELECT "Date" FROM "table_69645" WHERE "Round" = 'quarterfinal' AND "Surface" = 'grass' AND "Tournament" = 'nsw building society open'