Name the date for grass surface for quarterfinal at the nsw building society open tournament
CREATE TABLE table_69645 (
    "Tournament" text,
    "Date" text,
    "Surface" text,
    "Round" text,
    "Opponent" text
)
SELECT "Date" FROM table_69645 WHERE "Surface" = 'grass' AND "Round" = 'quarterfinal' AND "Tournament" = 'nsw building society open'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Name the date for grass surface for quarterfinal at the nsw building society open tournament ### Input: CREATE TABLE table_69645 (
    "Tournament" text,
    "Date" text,
    "Surface" text,
    "Round" text,
    "Opponent" text
) ### Response: SELECT "Date" FROM table_69645 WHERE "Surface" = 'grass' AND "Round" = 'quarterfinal' AND "Tournament" = 'nsw building society open'