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A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. [1] For example, the current year is numbered 2025 in the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).
For computational reasons, astronomical year numbering and the ISO 8601 standard designate years so that AD 1 = year 1, 1 BC = year 0, 2 BC = year −1, etc. [c] In common usage, ancient dates are expressed in the Julian calendar, but ISO 8601 uses the Gregorian calendar and astronomers may use a variety of time scales depending on the ...
The prefix AD and the suffixes CE, BC or BCE (Common Era, Before Christ or Before Common Era) are dropped. [1] The year 1 BC/BCE is numbered 0, the year 2 BC is numbered −1, and in general the year n BC/BCE is numbered "−(n − 1)" [1] (a negative number equal to 1 − n). The numbers of AD/CE years are not changed and are written with ...
See calendar and list of calendars for other groupings of years. See history , history by period , and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang , Geologic time scale , Timeline of evolution , and Logarithmic timeline .
Early Iron Age (c. 1050 BC – 776 BC) – part of the Greek Dark Ages; Classical antiquity (776 BC – 476 AD) Archaic Greece (776 BC – 480 BC) – begins with the First Olympiad, traditionally dated 776 BC; Classical Greece (480 BC – 338 BC) Macedonian era (338 BC – 323 BC) Hellenistic Greece (323 BC – 146 BC) Late Roman Republic (147 ...
Hebrew calendar: 3721–3722: Hindu calendars - Vikram Samvat: 17–18 - Shaka Samvat: N/A - Kali Yuga: 3061–3062: Holocene calendar: 9961: Iranian calendar: 661 BP – 660 BP: Islamic calendar: 681 BH – 680 BH: Javanese calendar: N/A: Julian calendar: 40 BC XL BC: Korean calendar: 2294: Minguo calendar: 1951 before ROC 民前1951年 ...
Javanese calendar: N/A: Julian calendar: 45 BC XLV BC: Korean calendar: 2289: Minguo calendar: 1956 before ROC 民前1956年: Nanakshahi calendar: −1512: Seleucid era: 267/268 AG: Thai solar calendar: 498–499: Tibetan calendar: 阴木猪年 (female Wood-Pig) 82 or −299 or −1071 — to — 阳火鼠年 (male Fire-Rat) 83 or −298 or −1070
The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1". 1st century AD (Anno Domini) follows.