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_68 (date VARCHAR, result VARCHAR, location VARCHAR, year VARCHAR, loser VARCHAR)
### Question:
Which date had a year under 1988, loser of Philadelphia Eagles, location of Giants Stadium, and a result of 21-0?
### Answer:
SELECT date FROM table_name_68 WHERE year < 1988 AND loser = "philadelphia eagles" AND location = "giants stadium" AND result = "21-0"