Which date had a year under 1988, loser of Philadelphia Eagles, location of Giants Stadium, and a result of 21-0?
CREATE TABLE table_46273 (
    "Year" real,
    "Date" text,
    "Winner" text,
    "Result" text,
    "Loser" text,
    "Location" text
)
SELECT "Date" FROM table_46273 WHERE "Year" < '1988' AND "Loser" = 'philadelphia eagles' AND "Location" = 'giants stadium' AND "Result" = '21-0'
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: Which date had a year under 1988, loser of Philadelphia Eagles, location of Giants Stadium, and a result of 21-0? ### Input: CREATE TABLE table_46273 (
    "Year" real,
    "Date" text,
    "Winner" text,
    "Result" text,
    "Loser" text,
    "Location" text
) ### Response: SELECT "Date" FROM table_46273 WHERE "Year" < '1988' AND "Loser" = 'philadelphia eagles' AND "Location" = 'giants stadium' AND "Result" = '21-0'