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Alternatively, the secular abbreviations CE and BCE are used, respectively.
There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC.
Because BC is the English abbreviation for Before Christ, it is sometimes incorrectly concluded that AD means After Death, i.e., after the death of Jesus.
If that were true, the thirty-three or so years of his life would not be in any era.
Although the last non-imperial consul, Basilius, was appointed in 541 by Emperor Justinian I, later emperors through Constans II (641–668) were appointed consuls on the first 1 January after their accession.
All of these emperors, except Justinian, used imperial post-consular years for all of the years of their reign alongside their regnal years.
When the reckoning from Jesus' incarnation started replacing the previous dating systems in western Europe, different people chose different Christian feast days to begin the year: Christmas, Annunciation, or Easter.
Thus, depending on the time and place, year number changed on different days, which created slightly different styles in chronology: With these various styles, the same day could, in some cases, be dated in 1099, 1100 or 1101.
The 15th year of his reign would then be 26 or 27 AD, placing Jesus' birth about 5 or 4 BC (because there is no year 0).For decades, it has been the unofficial global standard, adopted for pragmatic interests of international communication, transportation and commercial integration and recognized by international institutions such as the United Nations and the Universal Postal Union.