18 Maachị bu ubochi nke 18th (nke iri na asatọ) na onwa ana kpo Maachị. Na Gregorian calender, 18 Maachị bu ubochi nke 77th (78th na afo nke ana-kpo leap year) na afo. Anyi nwere agugu ubochi 288 du mgbe afo na agwu.