Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT date FROM table_name_68 WHERE year < 1988 AND loser = "philadelphia eagles" AND location = "giants stadium" AND result = "21-0"