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

### Instruction:
On what date is the winning team Abt Sportsline and pole position Mattias Ekström in the Circuit Ricardo Tormo , Valencia?

### Inputs:
table_name: table, columns: ['Round', 'Circuit', 'Date', 'Pole Position', 'Fastest Lap', 'Winning Driver', 'Winning Team']

### Response:
SELECT Date FROM table WHERE Winning Team = Abt Sportsline AND Pole Position = Mattias Ekström AND Circuit = Circuit Ricardo Tormo , Valencia