On what date is the winning team Abt Sportsline and pole position Mattias Ekstr m in the Circuit Ricardo Tormo , Valencia?
CREATE TABLE table_28544 (
    "Round" text,
    "Circuit" text,
    "Date" text,
    "Pole Position" text,
    "Fastest Lap" text,
    "Winning Driver" text,
    "Winning Team" text
)
SELECT "Date" FROM table_28544 WHERE "Winning Team" = 'Abt Sportsline' AND "Pole Position" = 'Mattias Ekström' AND "Circuit" = 'Circuit Ricardo Tormo , Valencia'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: On what date is the winning team Abt Sportsline and pole position Mattias Ekstr m in the Circuit Ricardo Tormo , Valencia? ### Input: CREATE TABLE table_28544 (
    "Round" text,
    "Circuit" text,
    "Date" text,
    "Pole Position" text,
    "Fastest Lap" text,
    "Winning Driver" text,
    "Winning Team" text
) ### Response: SELECT "Date" FROM table_28544 WHERE "Winning Team" = 'Abt Sportsline' AND "Pole Position" = 'Mattias Ekström' AND "Circuit" = 'Circuit Ricardo Tormo , Valencia'