CREATE TABLE table_14351 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Game site" CLOB, "Record" CLOB, "Attendance" FLOAT)

Name the date for w 31-28
SELECT "Date" FROM table_14351 WHERE "Result" = 'w 31-28'
SELECT "Date" FROM "table_14351" WHERE "Result" = 'w 31-28'