CREATE TABLE table_41061 ("Date" TEXT, "Title" TEXT, "Director" TEXT, "Production Cost" TEXT, "Singapore Gross" TEXT)

When was the film directed by Pen-Ek Ratanaruang released?
SELECT "Date" FROM table_41061 WHERE "Director" = 'pen-ek ratanaruang'
SELECT "Date" FROM "table_41061" WHERE "Director" = 'pen-ek ratanaruang'