23 Septemba bu ubochi nke 23rd (nke iri abụọ na atọ) na onwa ana kpo Septemba. Na Gregorian calender, 23 Septemba bu ubochi nke 266th (267th na afo nke ana-kpo leap year) na afo. Anyi nwere agugu ubochi 99 du mgbe afo na agwu.