The tournament with the opponent of Kelly De Beer Eva Pera was played on what date?
CREATE TABLE table_12171 (
    "Outcome" text,
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Partner" text,
    "Opponents" text,
    "Score" text
)
SELECT "Date" FROM table_12171 WHERE "Opponents" = 'kelly de beer eva pera'
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: The tournament with the opponent of Kelly De Beer Eva Pera was played on what date? ### Input: CREATE TABLE table_12171 (
    "Outcome" text,
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Partner" text,
    "Opponents" text,
    "Score" text
) ### Response: SELECT "Date" FROM table_12171 WHERE "Opponents" = 'kelly de beer eva pera'