<nowiki>siglo; Afe oha; öld; ပီႁူဝ်ပၢၵ်ႇ; abad; century; پېړۍ; yüzyıl; صدی; storočie; століття; Asyr; сядокиза; Jahrhundert; Asr; শতিকা; век; Joarhundad; Век; siècle; stoljeće; пинге; शतक; Omžios; век; Joerhonnert; århundre; əsr; Senijiuri; siglo; قرن; Kantved; ရာစုနှစ်; 世紀; Кылым; sṳ-ki; sieglu; segle; Быуат; Yüzyıl; Secol; aois; سده; 世纪; Ieu; საუკუნე; 世紀; seculo; Ƙarni; قرن; සියවස; saeculum; shelbersh; 世纪; ਸਦੀ; sentenio; நூற்றாண்டு; стагодзьдзе; гасыр; sèculu; ศตวรรษ; vijek; Стороча; secoło; Ngwagakgolo; Mācuīlpōhualxihuitl; Centurii; kansvledhen; Век; secol; vuosisata; Qarni; sekel; αιώνας; Դար; sècol; 世纪; yarcento; শতাব্দী; 세기; karne; jarcento; Abad; siglo; sieglo; Ёмюр; Sié-gī; Abad; Ĕмĕр; قرن; stolěśe; 世紀; יארהונדערט; سەدە; lětstotk; thế kỷ; eeuw; gadsimts; eeu; നൂറ്റാണ്ട്; БIаь шу; Pɩnzɩ mɩnɩʊ; Mwaka wechizana; centurie; Зуун; hundreår; Seiqgeij; abad; Abaik; Aastagasada; ಶತಮಾನ; Bonkámá; century; Gatostuig; Sa ro'y; århundrede; 世紀; Taonjato; évszázad; ክፍለ ዘመን; ოშწანურა; mende; Seserre; Вѣкъ; یوز ایل; Pachakwata; Jahrhundert; БӀешо; стагоддзе; Jahkečuohti; eeuwen; Sedsal; शताब्दी; Hundgēar; ГӀасру; Syiclle; stoljeće; século; מאה; гасыр; století; ctona'a; శతాబ్దం; ܕܪܐ; Juarhunert; Аср; sègle; Sè-kí; secolo; صدی; canrif; Syèk; sajandid; Eêuw; Abad; शताब्दी; Ieëf; Ọ̀rúndún; siglo; século; yelataib; sedsal; век; šimtmetis; stoletje; Daang taon; 世纪; Ғасыр; Secul; wiek; Linn; Tasut; Shekulli; Үйэ; صدي; century; século; ابد; 世纪; ئەسىر (يۈزيىل); unidad de tiempo equivalente a 100 años; unit of time lasting 100 years; száz egymást követő év; 100 urteko denboraldia; període de cent anys; Zeitspanne von einhundert Jahren; a hundred years; یکای زمان که صد سال است; 100年; periode der varer i 100 år; yüz yıllık zaman dilimi; سترہویصوی; tidsperiod som varar i 100 år; periòde de cent annadas; 100 సంవత్సరాలకు సమానమైన ఒక కాలమానం.; 100년의 시간 단위; mezurunuo de tempo; 100 jaroj; časový úsek trvající sto let; vremensko razdoblje u trajanju od 100 godina; periodo di tempo della durata di cento anni; période de cent années; sadan vuoden jakso; пэрыяд часу працягласьцю 100 гадоў; unidade de tempo equivalente a 100 anos; единица измерения времени в 100 лет; unit of time lasting 100 years; תקופה פון הונדערט יאר; 100 po sebe nasledujúcich rokov; časowa jednotka sto lět; Khoảng thời gian bằng 100 năm; unit masa 100 tahun lama; laika mērvienība, kas vienāda ar simts gadiem; paset ti panawen nga agpaut kadagiti 100 a tawen; јединица времена која траје 100 година; 時間單位，為 100 年; tréimhse 100 bliain; unidade de tempo equivalente a 100 anos; Wiek, stulecie jako jednostka czasu to 100 lat liczone od roku kończącego się cyframi "01" do najbliższego roku kończącego się dwoma zerami.; satuan waktu yang terdiri dari 100 tahun; tidsperiode; tidsperiode; yüz il; หน่วยเวลาที่คิด 100 ปี ต่อ 1 ศตวรรษ; razdoblje vremena u trajanju od 100 godina; 100 ವರ್ಷಗಳ ಕಾಲದ ಸಮಯ ಘಟಕ; 100年間を指す呼称; período de cen anos; unidat di tempu ekivalente na 100 aña; 一百年; проміжок часу, дорівнює ста рокам; sec; század; lětstotk; столетие; Århundre; Centennium; Jhdt.; Hektode; Zentennium; Jh.; Jhd.; Jahrh.; Jhrh.; hundert Jahre; einhundert Jahre; thế kỉ; céad; centuria; 世紀; вијек; столеће; стољеће; asır; сто років; séculos; kurun; århundrade; Stulecie; s.; vek; stoljeće; 100 vuoden jakso; s.; శతాబ్ది; 백년; 백 년; 100년; centenary; centennial; centurial; hundred years; one hundred years; jc; столетие; vijek</nowiki>
In the traditional notation for common calendars (including the Gregorian or Julian calendars), AD and BC years are both counted positively and inclusively (from the same epoch), but year order is reversed in BC since numbers are still positive and there's also no "year zero" in any period (there's also no "century zero" and no "millenium zero" in these common calendars):
the Nth century AD starts in the base year (N×100 − 99) AD, and ends in year (N×100) AD — these AD years in the Gregorian calendar are the same in astronomic years which are strictly positive for this AD period;
the Nth century BC starts in the base year (N×100) BC, and ends in year (N×100 − 99) BC — you need to substract 1 from the BC (positive) years in the proleptic Gregorian calendar, before changing the sign to get astronomic years which are negative (or zero) for this BC period ; astronomical year numbering does use a minus sign and includes a "year 0", so year 1 BC is equal to astronomical year 0, which comes just after year 2 BC equal to astronomical year -1, and so forth.
So for example:
the 21st century ADends on 31 December 2100 AD, but starts on 1 January 2001 AD (which also start of the 3rd millenium AD, itself terminated on 31 December 3000 AD);
the 10th century BC ends on 31 December 901 BC, but starts on 1 January 1000 BC(which also starts the 1st millenium BC, itself terminated on 31 December 1 BC, i.e. at end of astronomic year 0).
Note that both the Gregorian and Julian calendars still did not exist in that BC period, but both calendars are commonly extended today so that their "proleptic" year numbers do not even match each other, and also do not match with the prior calendars using different epochs (the old Royal calendars, then the Republican Roman calendar still used at start of the Roman Empire until 42 AD when the Julian calendar was finally regularized). The Gregorian calendar started to replace the Julian calendar only after 1584 AD (at different dates depending on countries), and became the de facto worldwide standard (except for religious purposes) only during the 18th century AD, creating a shift with a dozen days skipped in the year where it was ordered (this difference continues to grow by one day at end of three of four centuries).
