CREATE TABLE table_35535 ("Date" CLOB, "ID code of his Zero Fighter" CLOB, "Flight hours" CLOB, "Count" CLOB, "Sub-total" CLOB)

On which day were the subtotal hours 9:30?
SELECT "Date" FROM table_35535 WHERE "Sub-total" = '9:30'
SELECT "Date" FROM "table_35535" WHERE "Sub-total" = '9:30'