CREATE TABLE table_26615 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Location" CLOB, "Final Score" CLOB, "Attendance" FLOAT, "Record" CLOB)

Name the date for l 28 15
SELECT "Date" FROM table_26615 WHERE "Final Score" = 'L 28–15'
SELECT "Date" FROM "table_26615" WHERE "Final Score" = 'L 28–15'