CREATE TABLE table_77533 ("Date" CLOB, "Visitor" CLOB, "Score" CLOB, "Home" CLOB, "Decision" CLOB, "Attendance" FLOAT, "Record" CLOB)

What was the date of the game when the Canadiens had a record of 31 19 9?
SELECT "Date" FROM table_77533 WHERE "Record" = '31–19–9'
SELECT "Date" FROM "table_77533" WHERE "Record" = '31–19–9'