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Year numbering

2018 in various calendars
Gregorian calendar 2018
MMXVIII
Ab urbe condita 2771
Armenian calendar 1467
ԹՎ ՌՆԿԷ
Assyrian calendar 6768
Bahá'í calendar 174–175
Balinese saka calendar 1939–1940
Bengali calendar 1425
Berber calendar 2968
British Regnal year 66 Eliz. 2 – 67 Eliz. 2
Buddhist calendar 2562
Burmese calendar 1380
Byzantine calendar 7526–7527
Chinese calendar 丁酉(Fire Rooster)
4714 or 4654
    — to —
戊戌年 (Earth Dog)
4715 or 4655
Coptic calendar 1734–1735
Discordian calendar 3184
Ethiopian calendar 2010–2011
Hebrew calendar 5778–5779
Hindu calendars
 - Vikram Samvat 2074–2075
 - Shaka Samvat 1939–1940
 - Kali Yuga 5118–5119
Holocene calendar 12018
Igbo calendar 1018–1019
Iranian calendar 1396–1397
Islamic calendar 1439–1440
Japanese calendar Heisei 30
(平成30年)
Javanese calendar 1951–1952
Juche calendar 107
Julian calendar Gregorian minus 13 days
Korean calendar 4351
Minguo calendar ROC 107
民國107年
Nanakshahi calendar 550
Thai solar calendar 2561
Tibetan calendar 阴火鸡年
(female Fire-Rooster)
2144 or 1763 or 991
    — to —
阳土狗年
(male Earth-Dog)
2145 or 1764 or 992
Unix time 1514764800 – 1546300799

A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras). The instant, date, or year from which time is marked is called the epoch of the era. There are many different calendar eras such as Saka Era.

In antiquity, regnal years were counted from the accession of a monarch. This makes the Chronology of the ancient Near East very difficult to reconstruct, based on disparate and scattered king lists, such as the Sumerian King List and the Babylonian Canon of Kings. In East Asia, reckoning by era names chosen by ruling monarchs ceased in the 20th century except for Japan, where they are still used.

For over a thousand years, ancient Assyria used a system of eponyms to identify each year. Each year at the Akitu festival (celebrating the Mesopotamian new year), one of a small group of high officials (including the king in later periods) would be chosen by lot to serve as the limmu for the year, which meant that he would preside over the Akitu festival and the year would bear his name. The earliest attested limmu eponyms are from the Assyrian trading colony at Karum Kanesh in Anatolia, dating to the very beginning of the 2nd millennium BC, and they continued in use until the end of the Neo-Assyrian Period, ca. 612 BC.


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