18 Jenụwarị bu ubochi nke 18th (nke iri na asatọ) na onwa ana kpo Jenụwarị. Na Gregorian calender, 18 Jenụwarị bu ubochi nke 18th na afo. Anyi nwere agugu ubochi 347 (348 na afo nke ana-kpo leap-year) du mgbe afo na agwu.