Common Era
Common Era and Before the Common Era are year notations for the Gregorian or Julian calendar, and are exactly equivalent to the Anno Domini and Before Christ notations. The expressions " CE" and "AD " each equally describe the current year; "400 BCE" and "400 BC" are the same year too. BCE/CE are primarily used to avoid religious connotations, by not referring to Jesus as Dominus .
History
Anno Domini
Around the year 525, the Christian monk Dionysius Exiguus devised the principle of taking the moment that he believed to be the date of the incarnation of Jesus to be the point from which years are numbered of the Christian ecclesiastical calendar. Dionysius labeled the column of the table in which he introduced the new era as "Anno Domini". He did this to replace the Era of the Martyrs system because he did not wish to continue the memory of a tyrant who persecuted Christians.This way of numbering years became more widespread in Europe, with Bede using it in England in 731. Bede also introduced the practice of dating years before 1 backwards, without a year zero though the name "BC" for this era did not happen until much later.
Vulgar Era
The first use of the Latin term anno aerae nostrae vulgaris may be in a 1615 book by Johannes Kepler. Kepler's intent was to distinguish the Anno Domini era, which was in popular use, from the dates of the German regnal year—i.e., the year of the reign of a sovereign—typically used in national law. The word "vulgar" originally meant "of the ordinary people", with no derogatory associations. Kepler used it again, as ab Anno vulgaris aerae, in a 1616 table of ephemerides, as well as in 1617. An English-language 1635 edition of that book, in its title page, may contain the earliest known use of "Vulgar Era". A 1701 book edited by John le Clerc includes the phrase "Before Christ according to the Vulgar Æra,6".The Merriam-Webster Dictionary gives 1716 as the date of first use of the term "vulgar era".
Common Era
The English phrase "Common Era" appears at least as early as 1708, and in a 1715 book on astronomy, it is used interchangeably with "Christian Era" and "Vulgar Era". A 1759 history book uses common æra in a generic sense to refer to "the common era of the Jews". The phrase "before the common era" may have first appeared in a 1770 work that also uses common era and vulgar era as synonyms in a translation of a book originally written in German. The 1797 edition of the Encyclopædia Britannica uses the terms vulgar era and common era synonymously.In 1835, in his book Living Oracles, Alexander Campbell wrote: "The vulgar Era, or Anno Domini; the fourth year of Jesus Christ, the first of which was but eight days". He refers to the common era as a synonym for vulgar era: "the fact that our Lord was born on the 4th year before the vulgar era, called Anno Domini, thus making the 42d year from his birth to correspond with the 38th of the common era". The Catholic Encyclopedia, in at least one article, reports all three terms being commonly understood by the early 20th century.
The phrase "common era", in lower case, also appeared in the 19th century in a "generic" sense, not necessarily to refer to the Christian Era, but to any system of dates in everyday use throughout a civilization. Thus, "the common era of the Jews", "the common era of the Mahometans", "common era of the world", or "the common era of the foundation of Rome". When it did refer to the Christian Era, it was sometimes qualified.
An adapted translation of Common Era into Latin as Era Vulgaris was adopted in the 20th century by some followers of Aleister Crowley, and thus the abbreviation "e.v." or "EV" may sometimes be seen as a replacement for AD.
Judaism
Although Jews have the Hebrew calendar, they often use the Gregorian calendar without the AD prefix, as Judaism does not recognize Jesus as the Messiah. As early as 1825, the abbreviation VE was in use among Jews to denote years in the Western calendar. Common Era has been in use for Hebrew lessons since before 1905. Jews have also used the term Current Era.Contemporary usage
Some academics in the fields of theology, education, archaeology and history have adopted CE and BCE notation despite some disagreement. A study conducted in 2014 found that the BCE/CE notation is not growing at the expense of BC and AD notation in the scholarly literature, and that both notations are used in a relatively stable fashion.Australia
In 2011, media reports suggested that the BC/AD notation in Australian school textbooks would be replaced by BCE/CE notation. The change drew opposition from some politicians and church leaders. Weeks after the story broke, the Australian Curriculum, Assessment and Reporting Authority denied the rumours and stated that the BC/AD notation would remain, with CE and BCE as an optional suggested learning activity.Canada
In 2013, the Canadian Museum of Civilization in Gatineau, which had previously switched to BCE/CE, decided to change back to BC/AD in material intended for the public while retaining BCE/CE in academic content.Nepal
The notation is in particularly common use in Nepal in order to disambiguate dates from the local calendar, Bikram or Vikram Sambat. Disambiguation is needed because the era of the Hindu calendar is quite close to the Common Era.United Kingdom
In 2002, an advisory panel for the religious education syllabus for England and Wales recommended introducing BCE/CE dates to schools, and by 2018 some local education authorities were using them.In 2018, the National Trust said it would continue to use BC/AD as its house style. English Heritage explains its era policy thus: "It might seem strange to use a Christian calendar system when referring to British prehistory, but the BC/AD labels are widely used and understood." Some parts of the BBC use BCE/CE, but some presenters have said they will not. As of October 2019, the BBC News style guide has entries for AD and BC, but not for CE or BCE. The style guide for The Guardian says, under the entry for CE/BCE: "some people prefer CE and BCE to AD and BC, which, however, remain our style".
United States
In the United States, the use of the BCE/CE notation in textbooks was reported in 2005 to be growing. Some publications have transitioned to using it exclusively. For example, the 2007 World Almanac was the first edition to switch to BCE/CE, ending a period of 138 years in which the traditional BC/AD dating notation was used. BCE/CE is used by the College Board in its history tests, and by the Norton Anthology of English Literature. Others have taken a different approach. The US-based History Channel uses BCE/CE notation in articles on non-Christian religious topics such as Jerusalem and Judaism. The 2006 style guide for the Episcopal Diocese Maryland Church News says that BCE and CE should be used. The US-based Society of Biblical Literature style guide for academic texts on religion prefers BCE/CE to BC/AD.In June 2006, in the United States, the Kentucky State School Board reversed its decision to use BCE and CE in the state's new Program of Studies, leaving education of students about these concepts a matter of local discretion.
Rationales
Support
The use of CE in Jewish scholarship was historically motivated by the desire to avoid the implicit "Our Lord" in the abbreviation AD. Although other aspects of dating systems are based in Christian origins, AD is a direct reference to Jesus as Lord. Proponents of the Common Era notation assert that the use of BCE/CE shows sensitivity to those who use the same year numbering system as the one that originated with and is currently used by Christians, but who are not themselves Christian. Former Secretary-General of the United Nations Kofi Annan has argued:Adena K. Berkowitz, in her application to argue before the United States Supreme Court, opted to use BCE and CE because, "Given the multicultural society that we live in, the traditional Jewish designations—B.C.E. and C.E.—cast a wider net of inclusion." In the World History Encyclopedia, Joshua J. Mark wrote "Non-Christian scholars, especially, embraced because they could now communicate more easily with the Christian community. Jewish, Islamic, Hindu and Buddhist scholars could retain their calendar but refer to events using the Gregorian Calendar as BCE and CE without compromising their own beliefs about the divinity of Jesus of Nazareth." In History Today, Michael Ostling wrote: "BC/AD Dating: In the year of whose Lord? The continuing use of AD and BC is not only factually wrong but also offensive to many who are not Christians."
Opposition
Critics note that there is no difference in the epoch of the two systems—both chosen to be close to the date of birth of Jesus. Since the year numbers are the same, the use of BCE and CE dates should be equally offensive to adherents of religions other than Christianity as the use of BC and AD dates. Roman Catholic priest and writer on interfaith issues Raimon Panikkar argued that the BCE/CE usage is the less inclusive option since the notation still uses the Christian calendar numbers, forcing it on non-Christian nations and individuals. In 1993, the English-language expert Kenneth G. Wilson speculated a slippery slope scenario in his style guide: "If we do end by casting aside the AD/BC convention, almost certainly some will argue that we ought to cast aside as well the conventional numbering system itself, given its Christian basis."Some Christians are offended by the removal of the explicit reference to Jesus.