CREATE TABLE table_203_280 (id DECIMAL, "week" DECIMAL, "date" TEXT, "opponent" TEXT, "result" TEXT, "record" TEXT, "game site" TEXT, "tv time" TEXT, "attendance" DECIMAL, "bye" TEXT)

when was their first loss of the season ?
SELECT "date" FROM table_203_280 WHERE "result" = 'l' ORDER BY id LIMIT 1
SELECT "date" FROM "table_203_280" WHERE "result" = 'l' ORDER BY "id" NULLS FIRST LIMIT 1