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_name_76 (date VARCHAR, bills_first_downs VARCHAR, opponent VARCHAR)
### Question:
Which date did the oakland raiders play as the opponent when the Bills first downs were under 28?
### Answer:
SELECT date FROM table_name_76 WHERE bills_first_downs < 28 AND opponent = "oakland raiders"