28 Septemba bu ubochi nke 28th (nke iri abụọ na asatọ) na onwa ana kpo Septemba. Na Gregorian calender, 28 Septemba bu ubochi nke 271st (272nd na afo nke ana-kpo leap year) na afo. Anyi nwere agugu ubochi 94 du mgbe afo na agwu.