CREATE TABLE table_name_12 (date VARCHAR2, year VARCHAR2, loser VARCHAR2, location VARCHAR2)

what date saw the chicago bears lose in green bay earlier than 1931?
SELECT date FROM table_name_12 WHERE loser = "chicago bears" AND location = "green bay" AND year < 1931
SELECT "date" FROM "table_name_12" WHERE "chicago bears" = "loser" AND "green bay" = "location" AND "year" < 1931