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

### Instruction:
What is the date of the race when Jack Brabham is in the pole position and the circuit is Spa-Francorchamps?

### Inputs:
table_name: table, columns: ['Race', 'Circuit', 'Date', 'Pole position', 'Fastest lap', 'Winning driver', 'Constructor', 'Tyre', 'Report']

### Response:
SELECT Date FROM table WHERE Pole position = jack brabham AND Circuit = spa-francorchamps