CREATE TABLE table_8616 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Record" CLOB, "Attendance" CLOB)

What date did the Ravens play the buffalo bills?
SELECT "Date" FROM table_8616 WHERE "Opponent" = 'buffalo bills'
SELECT "Date" FROM "table_8616" WHERE "Opponent" = 'buffalo bills'