Na ogúafọr ndi Julian ma Gregorian, Jenụwarị bụ ọnwa mbụ na afọ nile, bụ otu ọnwa n'ime asaa nwere ubochi ruru 31 (iri atọ na otu). Ma ụbọchi kena, otu afọ nwere ọnwa iri na abụọ.