Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When was the film directed by Pen-Ek Ratanaruang released?

### Inputs:
table_name: table, columns: ['Date', 'Title', 'Director', 'Production Cost', 'Singapore Gross']

### Response:
SELECT Date FROM table WHERE Director = pen-ek ratanaruang