Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_25213146_2 (date VARCHAR, winning_team VARCHAR)
### Question:
On what date(s) was the winning team Prema Powerteam?
### Answer:
SELECT date FROM table_25213146_2 WHERE winning_team = "Prema Powerteam"