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Common Era and Before the Common Era are alternatives to the original Anno Domini (AD) and Before Christ (BC) notations used for the same calendar era. The two notation systems are numerically equivalent: "2025 CE" and "AD 2025" each describe the current year; "400 BCE" and "400 BC" are the same year. [1] [2]
It is going to take a long time, ... There is a difference between facts and values, or opinions. ... The fourth argument is that BCE and BC really mean the same ...
2251 BC: 4200 BP Beginning of the Meghalayan age, the current and latest of the three stages in the Holocene era. [22] [23] 45 BC: 1994 BP Introduction of the Julian calendar: 1 BC: 1950 BP Year zero in ISO 8601: AD 1: 1949 BP Beginning of the Common Era and Anno Domini, from the estimate by Dionysius of the Incarnation of Jesus: 1582 368 BP
BCE and CE or BC and AD are written in upper case, unspaced, without a full stop (period), and separated from the numeric year by a space (5 BC, not 5BC). It is advisable to use a non-breaking space. AD appears before or after a year (AD 106, 106 AD); BCE, CE, and BC always appear after (106 CE, 3700 BCE, 3700 BC).
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 either no sign or a positive sign; thus in general n AD/CE is simply n or + n . [ 1 ]
The AP dating system took its start from 'The Year of The Passion'. It is generally accepted by experts there is a 27-year difference between AP and AD reference. [20] The date of birth of Jesus of Nazareth is not stated in the gospels or in any secular text, but most scholars assume a date of birth between 6 BC and 4 BC. [21]
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).
However, there is a year zero in both the astronomical year numbering system (where it coincides with the Julian year 1 BC), and the ISO 8601:2004 system, a data interchange standard for certain time and calendar information (where year zero coincides with the Gregorian year 1 BC; see conversion table).