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Calendar era facts for kids

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2021 in various calendars
Gregorian calendar 2021
MMXXI
Ab urbe condita 2774
Armenian calendar 1470
ԹՎ ՌՆՀ
Assyrian calendar 6771
Bahá'í calendar 177–178
Balinese saka calendar 1942–1943
Bengali calendar 1428
Berber calendar 2971
British Regnal year 69 Eliz. 2 – 70 Eliz. 2
Buddhist calendar 2565
Burmese calendar 1383
Byzantine calendar 7529–7530
Chinese calendar 庚子年 (Metal Rat)
4717 or 4657
    — to —
辛丑年 (Metal Ox)
4718 or 4658
Coptic calendar 1737–1738
Discordian calendar 3187
Ethiopian calendar 2013–2014
Hebrew calendar 5781–5782
Hindu calendars
 - Vikram Samvat 2077–2078
 - Shaka Samvat 1942–1943
 - Kali Yuga 5121–5122
Holocene calendar 12021
Igbo calendar 1021–1022
Iranian calendar 1399–1400
Islamic calendar 1442–1443
Japanese calendar Reiwa 3
(令和3年)
Javanese calendar 1954–1955
Juche calendar 110
Julian calendar Gregorian minus 13 days
Korean calendar 4354
Minguo calendar ROC 110
民國110年
Nanakshahi calendar 553
Thai solar calendar 2564
Tibetan calendar 阳金鼠年
(male Iron-Rat)
2147 or 1766 or 994
    — to —
阴金牛年
(female Iron-Ox)
2148 or 1767 or 995
Unix time 1609459200 – 1640995199

A calendar era is the year numbering system used by a calendar. The Gregorian calendar for example numbers its years in the Western Anno Domini system (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 ancient times, regnal years were counted from the year a new monarch took the throne. This makes ancient timelines very difficult to reconstruct, because they are based on separate and scattered king lists, such as the Sumerian King List and the Babylonian Canon of Kings. In East Asia, having era names based on ruling monarchs ended in the 20th century except for Japan, where they are still used.

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Calendar era Facts for Kids. Kiddle Encyclopedia.