Common Era

"BCE" redirects here. For other uses, see BCE (disambiguation).

Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. 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: "2024 CE" and "AD 2024" each describe the current year; "400 BCE" and "400 BC" are the same year.^[1][2]

The expression can be traced back to 1615, when it first appears in a book by Johannes Kepler as the Latin: annus aerae nostrae vulgaris (year of our common era),^[3][4] and to 1635 in English as "Vulgar Era".^{[lower-alpha 1]} The term "Common Era" can be found in English as early as 1708,^[5] and became more widely used in the mid-19th century by Jewish religious scholars. Since the late 20th century, BCE and CE have become popular in academic and scientific publications on the grounds that BCE and CE are religiously neutral terms.^{[6][lower-alpha 2]} They have been promoted as more sensitive to non-Christians by not referring to Jesus, the central figure of Christianity, especially via the religious terms "Christ" and Dominus ("Lord") used by the other abbreviations.^{[7][8][lower-alpha 3]} Nevertheless, its epoch remains the same as that used for the Anno Domini era.

History

Origins

See also: Anno Domini

The idea of numbering years beginning from the date that he believed to be the date of birth of Jesus, was conceived around the year 525 by the Christian monk Dionysius Exiguus. He did this to replace the then dominant Era of Martyrs system, because he did not wish to continue the memory of a tyrant who persecuted Christians.^[10]: 50 He numbered years from an initial reference date ("epoch"), an event he referred to as the Incarnation of Jesus.^[10][11][12] Dionysius labeled the column of the table in which he introduced the new era as "Anni Domini Nostri Jesu Christi" (Of the year of our Lord Jesus Christ].^[10]: 52

This way of numbering years became more widespread in Europe with its use by Bede in England in 731. Bede also introduced the practice of dating years before what he supposed was the year of birth of Jesus,^{[lower-alpha 4]} without a year zero.^{[lower-alpha 5]} In 1422, Portugal became the last Western European country to switch to the system begun by Dionysius.^[14]

Vulgar Era

Johannes Kepler 1571–1630, the German astronomer, mathematician, astrologer, natural philosopher and writer on music.^[15]

The term "Common Era" is traced back in English to its appearance as "Vulgar Era" to distinguish years of the Anno Domini era, which was in popular use, from dates of the regnal year (the year of the reign of a sovereign) typically used in national law.^[16] (The word 'vulgar' originally meant 'of the ordinary people', with no derogatory associations.^[17])

The first use of the Latin term anno aerae nostrae vulgaris^{[lower-alpha 6]} may be that in a 1615 book by Johannes Kepler.^[4] Kepler uses it again, as ab Anno vulgaris aerae, in a 1616 table of ephemerides,^[18] and again, as ab anno vulgaris aerae, in 1617.^[19] A 1635 English edition of that book has the title page in English that may be the earliest-found use of Vulgar Era in English.^{[20][lower-alpha 7]} A 1701 book edited by John Le Clerc includes the phrase "Before Christ according to the Vulgar Æra, 6".^[21]

The Merriam Webster Dictionary gives 1716 as the date of first use of the term "vulgar era" (which it defines as Christian era).^{[22][lower-alpha 8]}

The first published use of "Christian Era" may be the Latin phrase annus aerae christianae on the title page of a 1584 theology book, De Eucharistica controuersia.^[24] In 1649, the Latin phrase annus æræ Christianæ appeared in the title of an English almanac.^[25] A 1652 ephemeris may be the first instance found so far of the English use of "Christian Era".^[26]

The English phrase "Common Era" appears at least as early as 1708,^[5] and in a 1715 book on astronomy it is used interchangeably with "Christian Era" and "Vulgar Era".^[27] A 1759 history book uses common æra in a generic sense, to refer to "the common era of the Jews".^[28] The first use of the phrase "before the common era" may be that in a 1770 work that also uses common era and vulgar era as synonyms, in a translation of a book originally written in German.^[29] The 1797 edition of the Encyclopædia Britannica uses the terms vulgar era and common era synonymously.^[30][31] 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",^[32] and also refers to the common era as a synonym for vulgar era with "the fact that our Lord was born on the 4th year before the vulgar era, called Anno Domini, thus making (for example) the 42d year from his birth to correspond with the 38th of the common era".^[33] The Catholic Encyclopedia (1909) in at least one article reports all three terms (Christian, Vulgar, Common Era) being commonly understood by the early 20th century.^[34]

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 common use throughout a civilization. Thus, "the common era of the Jews",^[35][36] "the common era of the Mahometans",^[37] "common era of the world",^[38] "the common era of the foundation of Rome".^[39] When it did refer to the Christian Era, it was sometimes qualified, e.g., "common era of the Incarnation",^[40] "common era of the Nativity",^[41] or "common era of the birth of Christ".^[42]

An adapted translation of Common Era into Latin as Era Vulgaris^{[lower-alpha 9]} 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.^[44]

History of the use of the CE/BCE abbreviation

Although Jews have their own Hebrew calendar, they often use the Gregorian calendar without the AD prefix.^[45] As early as 1825, the abbreviation VE (for Vulgar Era) was in use among Jews to denote years in the Western calendar.^[46] As of 2005^[update], Common Era notation has also been in use for Hebrew lessons for more than a century.^[47] Jews have also used the term Current Era.^[48]

Contemporary usage

Some academics in the fields of theology, education, archaeology and history have adopted CE and BCE notation despite some disagreement.^[49] 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.^[50]

Australia

In 2011, media reports suggested that the BC/AD notation in Australian school textbooks would be replaced by BCE/CE notation.^[51] 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.^[52]

Canada

In 2013, the Canadian Museum of Civilization (now the Canadian Museum of History) in Gatineau (opposite Ottawa), 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.^[53]

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 local 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,^[54] and by 2018 some local education authorities were using them.^[55]

In 2018, the National Trust said it would continue to use BC/AD as its house style.^[55] 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."^[56] Some parts of the BBC use BCE/CE, but some presenters have said they will not.^[55] As of October 2019, the BBC News style guide has entries for AD and BC, but not for CE or BCE.^[57] The style guide for The Guardian says, under the entry for CE/BCE: "some people prefer CE (common era, current era, or Christian era) and BCE (before common era, etc.) to AD and BC, which, however, remain our style".^[58]

United States

In the United States, the use of the BCE/CE notation in textbooks was reported in 2005 to be growing.^[47] 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,^[59] 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.^[60] The 2006 style guide for the Episcopal Diocese Maryland Church News says that BCE and CE should be used.^[61]

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.^[62][63][64]

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.^{[lower-alpha 3]} Although other aspects of dating systems are based in Christian origins, AD is a direct reference to Jesus as Lord.^[65][66][67] 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.^[68] Former United Nations Secretary-General Kofi Annan has argued:^[69]

[T]he Christian calendar no longer belongs exclusively to Christians. People of all faiths have taken to using it simply as a matter of convenience. There is so much interaction between people of different faiths and cultures – different civilizations, if you like – that some shared way of reckoning time is a necessity. And so the Christian Era has become the Common Era.^[70]

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."^[71] In the World History Encyclopedia, Joshua J. Mark wrote "Non-Christian scholars, especially, embraced [CE and BCE] because they could now communicate more easily with the Christian community. Jewish, Islamic, Hindu and Buddhist scholars could retain their [own] 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."^[72] 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."^[67]

Opposition

Critics note the fact that there is no difference in the epoch of the two systems—chosen to be close to the date of birth of Jesus. Since the year numbers are the same, BCE and CE dates should be equally offensive to other religions as BC and AD.^[73] Roman Catholic priest and writer on interfaith issues Raimon Panikkar argued that the BCE/CE usage is the less inclusive option since they are still using the Christian calendar numbers and forcing it on other nations.^[74] In 1993, the English-language expert Kenneth G. Wilson speculated a slippery slope scenario in his style guide that, "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 [that is, the method of numbering years] itself, given its Christian basis."^[75]

Some Christians are offended by the removal of the reference to Jesus,^[76] including the Southern Baptist Convention.^[77]

Conventions in style guides

The abbreviation BCE, just as with BC, always follows the year number. Unlike AD, which still often precedes the year number, CE always follows the year number (if context requires that it be written at all).^[78] Thus, the current year is written as 2024 in both notations (or, if further clarity is needed, as 2024 CE, or as AD 2024), and the year that Socrates died is represented as 399 BCE (the same year that is represented by 399 BC in the BC/AD notation). The abbreviations are sometimes written with small capital letters, or with periods (e.g., "B.C.E." or "C.E.").^[79] The US-based Society of Biblical Literature style guide for academic texts on religion prefers BCE/CE to BC/AD.^[80]

Similar conventions in other languages

• In Germany, Jews in Berlin seem to have already been using words translating to "(before the) common era" in the 18th century, while others like Moses Mendelssohn opposed this usage as it would hinder the integration of Jews into German society.^[81] The formulation seems to have persisted among German Jews in the 19th century in forms like vor der gewöhnlichen Zeitrechnung (before the common chronology).^[82][83] In 1938 Nazi Germany, the use of this convention was also prescribed by the National Socialist Teachers League.^[84] However, it was soon discovered that many German Jews had been using the convention ever since the 18th century, and Time magazine found it ironic to see "Aryans following Jewish example nearly 200 years later".^[81]
• In Spanish, common forms used for "BC" are a. C. and a. de C. (for "antes de Cristo", "before Christ"), with variations in punctuation and sometimes the use of J. C. (Jesucristo) instead of C. The Real Academia Española also acknowledges the use of a. n. e. (antes de nuestra era, 'before our era') and d. n. e. (después de nuestra era, 'after our era').^[85] In scholarly writing, a. e. c. is the equivalent of the English "BCE", "antes de la era común" or "Before the Common Era".^[86]
• In Welsh, OC can be expanded to equivalents of both AD (Oed Crist) and CE (Oes Cyffredin); for dates before the Common Era, CC (traditionally, Cyn Crist) is used exclusively, as Cyn yr Oes Cyffredin would abbreviate to a mild obscenity.^{[87] [better source needed]}
• In Russian since the October Revolution (1917) до н.э. (до нашей эры, lit. before our era) and н.э. (нашей эры, lit. of our era) are used almost universally. Within Christian churches до Р.Х./от Р.Х. (до/от Рождества Христова, i.e. before/after the birth of Christ, equivalent to Latin: Ante Christum natum) remains in use.
• In Polish, "p.n.e." (przed naszą erą, lit. before our era) and "n.e." (naszej ery, lit. of our era) are commonly used in historical and scientific literature. Przed Chrystusem (before Christ) and po Chrystusie (after Christ) see sporadic usage, mostly in religious publications.
• In China, upon the foundation of the Republic of China, the Government in Nanking adopted the Republic of China calendar with 1912 designated as year 1, but used the Western calendar for international purposes. The translated term was Chinese: 西元 (xī yuán, "Western Era"), which is still used in Taiwan in formal documents. In 1949, the People's Republic of China adopted 公元 (gōngyuán, "Common Era") for both internal and external affairs in mainland China. This notation was extended to Hong Kong in 1997 and Macau in 1999 (de facto extended in 1966) through Annex III of Hong Kong Basic Law and Macau Basic Law, thus eliminating the ROC calendar in these areas. BC is translated into Chinese as 公元前 (gōngyuánqián, "Before the Common Era").
• In Czech, the "n. l." (našeho letopočtu which translates as of our year count) and "př. n. l." or "před n. l." (před naším letopočtem meaning before our year count) is used, always after the year number. The direct translation of AD (léta Páně, abbreviated as L. P.) or BC (před Kristem, abbreviated as př. Kr.) is seen as archaic.^[88]
• In Croatian the common form used for BC and AD are pr. Kr. (prije Krista, "before Christ")^[89] and p. Kr. (poslije Krista, after Christ).^[90] The abbreviations pr. n. e. (prije nove ere, before new era)^[91] and n. e. (nove ere, (of the) new era)^[92] have also recently been introduced.
• In Danish, "f.v.t." (før vor tidsregning, before our time reckoning) and "e.v.t." (efter vor tidsregning, after our time reckoning) are used as BCE/CE are in English. Also commonly used are "f.Kr." (før Kristus, before Christ) and "e.Kr." (efter Kristus, after Christ), which are both placed after the year number in contrast with BC/AD in English.
• In Macedonian, the terms "п.н.е." (пред нашата ера "before our era") and "н.е." (наша ера "our era") are used in every aspect.^{[citation needed]}
• In Estonian, "e.m.a." (enne meie ajaarvamist, before our time reckoning) and "m.a.j." (meie ajaarvamise järgi, according to our time reckoning) are used as BCE and CE, respectively. Also in use are terms "eKr" (enne Kristust, before Christ) and "pKr" (pärast Kristust, after Christ). In all cases, the abbreviation is written after the year number.
• In Finnish, "eaa." (ennen ajanlaskun alkua, before time reckoning) and "jaa." (jälkeen ajanlaskun alun, after the start of time reckoning) are used as BCE and CE, respectively. Also (decreasingly) in use are terms "eKr", (ennen Kristusta, before Christ) and "jKr". (jälkeen Kristuksen, after Christ). In all cases, the abbreviation is written after the year number.

See also

• History portal

• Astronomical year numbering
• Before Present
• Calendar
• Calendar reform
• Holocene Era
• List of calendars

Explanatory notes

1. From the Latin word vulgus, the common people – to contrast it with the regnal year system of dating used by the government.
2. Two other systems that also do not use religious titles, the astronomical system and the ISO 8601 standard, do use a year zero. The year 1 BCE (identical to the year 1 BC) is represented as 0 in the astronomical system, and as 0000 in ISO 8601. Presently, ISO 8601 dating requires use of the Gregorian calendar for all dates, however, whereas astronomical dating and Common Era dating allow use of either the Gregorian or Julian calendars.
3. AD is shortened from anno Domini nostri Jesu Christi ("in the year of Our Lord Jesus Christ").^[9]
4. Bede wrote of the Incarnation of Jesus, but treated it as synonymous with birth.^[13]
5. As noted in History of the zero, the use of zero in Western civilization was uncommon before the twelfth century.
6. In Latin, 'Common Era' is written as Aera Vulgaris. It also occasionally appears, in Latin declination, as æræ vulgaris, aerae vulgaris, aeram vulgarem, anni vulgaris, vulgaris aerae Christianae, and anni vulgatae nostrae aerae Christianas.
7. As England did not adopt the Gregorian calendar until 1752, "vulgar" dates were determined according to the Julian calendar.
8. The probable source is a 1716 book in English by Dean Humphrey Prideaux which refers to, "...the vulgar Æra of Christ's incarnation and not from the true time of it."^[23] This citation is given in the 1933 edition of Oxford English Dictionary but without any assertion of first use.^[17]
9. era – or, with a macron, ēra – being an alternative form of aera; aera is the usual form^[43]

References

1. "Anno Domini". Merriam Webster Online Dictionary. Merriam-Webster. 2003. Retrieved 4 October 2011. Etymology: Medieval Latin, in the year of the Lord
2. "Controversy over the use of the "CE/BCE" and "AD/BC" dating notation/". Ontario Consultants on Religious Tolerance. Retrieved 12 November 2011.
3. Coolman, Robert. "Keeping Time: The Origin of B.C. & A.D." Live Science. Retrieved 11 November 2017.
4. Johannes Kepler (1615). Joannis Keppleri Eclogae chronicae: (etc) (in Latin). Frankfurt: Tampach. OCLC 62188677. Dabam Pragae Idibus Aprilibus, Anno vulgaris aerae MDCXII (Earliest-found use of "vulgaris aerae", Latin for Common Era) (1615)
5. The History of the Works of the Learned. Vol. 10. London. January 1708. p. 513. ... to the fourth century of the Common Era (Possibly the first use of common era in English (1708))
6. Espenak, Fred (25 February 2008). "Year dating conventions". NASA. Retrieved 24 August 2021.
7. Herrmann, Andrew (27 May 2006). "BCE date designation called more sensitive". Chicago Sun-Times. Archived from the original on 10 August 2017. Retrieved 18 September 2016. The changes – showing up at museums, in academic circles and in school textbooks – have been touted as more sensitive to people of faiths outside of Christianity. ... The use of BCE and CE have rankled some Christians
8. McKim, Donald K (1996). "C. E.". Westminster dictionary of theological terms. Westminster John Knox Press. p. 41. ISBN 978-0-664-25511-4.
9. Irvin, Dale T.; Sunquist, Scott (2001). History of the World Christian Movement. Continuum International Publishing Group. p. xi. ISBN 0-567-08866-9. The influence of western culture and scholarship upon the rest of the world in turn led to this system of dating becoming the most widely used one across the globe today. Many scholars in historical and religious studies in the West in recent years have sought to lessen the explicitly Christian meaning of this system without abandoning the usefulness of a single, common, global form of dating. For this reason the terms common era and before the common era, abbreviated as CE and BCE, have grown in popularity as designations. The terms are meant, in deference to non-Christians, to soften the explicit theological claims made by the older Latin terminology, while at the same time providing continuity with earlier generations of mostly western Christian historical research
10. Pedersen, O. (1983). "The Ecclesiastical Calendar and the Life of the Church". In Coyne, G.V.; et al. (eds.). Gregorian Reform of the Calendar: Proceedings of the Vatican Conference to commemorate its 400th anniversary. Vatican Observatory. p. 50. Retrieved 18 May 2011 – via SAO/NASA Astrophysics Data System (ADS).
11. Doggett, L.E., (1992), "Calendars" in Seidelmann, P.K., The Explanatory Supplement to the Astronomical Almanac, Sausalito CA: University Science Books, 2.1
12. Bromiley, Geoffrey W. (1995). The International Standard Bible Encyclopedia. Wm. B. Eerdmans Publishing. p. 686. ISBN 978-0-8028-3781-3.
13. Blackburn, B & Holford-Strevens, L, (2003), The Oxford Companion to the Year, Oxford University Press, 778.
14. "General Chronology". New Advent Catholic Encyclopedia. Vol. III. New York: Robert Appleton Company. 1908.
15. Jeans, Susi (2013) [2001]. "Kepler [Keppler], Johannes". Grove Music Online. Revised by H. Floris Cohen. Oxford: Oxford University Press. doi:10.1093/gmo/9781561592630.article.14903. ISBN 978-1-56159-263-0. Retrieved 26 September 2021. (subscription or UK public library membership required)
16. Weatherall, Claire (18 May 2023). "Library: Archival Skills: Historical dates". University of Hull. Retrieved 21 September 2024.
17. "Vulgar". Oxford English Dictionary. Vol. 12. 1933. p. 326.
18. Kepler, Johann (1616). Ephemerides novae motuum caelestium, ab Ānno vulgaris aerae MDCXVII en observationibus potissimum Tychonis Brahei hypothesibus physicis, et tabulis Rudolphinis... Plancus.
19. Keppler, Johannes; Bartsch, Jakob (1617). Ephemerides novae motuum coelestium, ab anno vulgaris aerae MDCXVII[-XXXVI]... [(per 1635 English edition): New Ephemerids for the Celestiall Motions, for the Yeeres of the Vulgar Era 1617–1636]. Johannes Plancus. Part 3 has title: Tomi L Ephemeridvm Ioannis Kepleri pars tertia, complexa annos à M.DC.XXIX. in M.DC.XXXVI. In quibus & tabb. Rudolphi jam perfectis, et sociâ operâ clariss. viri dn. Iacobi Bartschii ... Impressa Sagani Silesiorvm, in typographeio Ducali, svmptibvs avthoris, anno M.DC.XXX. (His third use of "vulgaris aerae" (Latin for Common Era) (1617))
20. Johann Kepler; Adriaan Vlacq (1635). Ephemerides of the Celestiall Motions, for the Yeers of the Vulgar Era 1633 ...
21. Le Clerc, John, ed. (1701). The Harmony of the Evangelists. London: Sam Buckley. p. 5. Before Christ according to the Vulgar Æra, 6
22. "Merriam Webster Online entry for Vulgar Era". Retrieved 18 May 2011.
23. Humphrey Prideaux, D.D. (1716). The Old and New Testament Connected in the History of the Jews and Neighbouring Nations. Vol. 1 (Second ed.). London. p. ii.
24. Clivaz, Claire (2012). "Common Era 2.0". Lire demain; Reading tomorrow. EPFL Press. p. 38. ISBN 9782889141494. ... the expression "Christian era" appears in Latin in a 1584 theology book (Grynaeus and Beumler 1584)
25. WING, Vincent (1649). Speculum uranicum, anni æræ Christianæ, 1649, or, An almanack and prognosication for the year of our Lord, 1649 being the first from bissextile or leap-year, and from the creation of the world 5598, wherein is contained many useful, pleasant and necessary observations, and predictions ... : calculated (according to art) for the meridian and latitude of the ancient borough town of Stamford in Lincolnshire ... and without sensible errour may serve the 3. kingdoms of England, Scotland, and Ireland. London: J.L. for the Company of Stationers. anni æræ Christianæ, 1649
26. Sliter, Robert (1652). A celestiall glasse, or, Ephemeris for the year of the Christian era 1652 being the bissextile or leap-year: contayning the lunations, planetary motions, configurations & ecclipses for this present year ... : with many other things very delightfull and necessary for most sorts of men: calculated exactly and composed for ... Rochester. London: Printed for the Company of Stationers.
27. Gregory, David; John Nicholson; John Morphew (1715). The Elements of Astronomy, Physical and Geometrical. Vol. 1. London: J. Nicholson. p. 252. Some say the World was created 3950 Years before the common Æra of Christ Before Christ and Christian Era appear on the same page 252, while Vulgar Era appears on page 250
28. Sale, George; Psalmanazar, George; Bower, Archibald; Shelvocke, George; Campbell, John; Swinton, John (1759). An Universal History: From the Earliest Accounts to the Present Time. Vol. 13. London: C. Bathurst [etc.] p. 130. And it doth not appear, that they began to reckon from the creation till after their Gemarrah was finished;at which time they fixed that for their common era [In this case, their refers to the Jews.]
29. Hooper, William; Bielfeld, Jacob Friedrich (1770). The Elements of Universal Erudition: Containing an Analytical Abridgment of the Sciences, Polite Arts, and Belles Lettres. Vol. 3. London: J Robson and B. Law. pp. 63, 105. The Spanish era began with the year of the world 3966, and 38 years before the common era (p63); 1796 years before the common era [...] 776 before the vulgar era. (p105) [Possibly the first English use of "before the common era", with "vulgar era" synonymous with "common era" (1770)]
30. MacFarquhar, Colin; Gleig, George (1797). "Peter". Encyclopædia Britannica. A. Bell and C. Macfarquhar. p. 228. St Peter died in the 66th year of the vulgar era
31. MacFarquhar, Colin; Gleig, George (1797). "Paul". Encyclopædia Britannica. A. Bell and C. Macfarquhar. p. 50. This happened in the 33rd year of the common era, some time after our Saviour's death.
32. Alexander Campbell (1835). The Living Oracles, Fourth Edition. pp. 16–20. Retrieved 18 May 2011.
33. Alexander Campbell (1835). The Living Oracles, Fourth Edition. pp. 15–16. Retrieved 18 May 2011.
34. "General Chronology". Catholic Encyclopedia. Foremost among these [various eras] is that which is now adopted by all civilized peoples and known as the Christian, Vulgar or Common Era, in the twentieth century of which we are now living.
35. A. Whitelaw, ed. (1874). "Epoch". Popular Encyclopedia or Conversations Lexicon. Vol. V. Oxford University Press. p. 207. the common era of the Jews places the creation in BC 3760
36. The first and second Advent: or, The past and the future with reference to the Jew, the gentile, and the Church of God. Wertheim, MacIntosh & Hunt. 1858. p. 176. Hence the present year, 1858, in the common era of the Jews, is AM 5618–5619, a difference of more than 200 years from our commonly-received chronology.
37. Gumpach, Johannes von (1856). Practical tables for the reduction of Mahometan dates to the Christian calendar. Oxford University Press. p. 4. Its epoch is the first of March old style. The common era of the Mahometans, as has already been stated, is that of the flight of Mahomet.
38. Jones, William (1801). The Theological, Philosophical and Miscellaneous Works of the Rev. William Jones. London: Rivington. p. 354.
39. Alexander Fraser Tytler (1854). Universal History: From the Creation of the World to the Beginning of the Eighteenth Century. Boston: Fetridge and Company. p. 284.
40. Baynes, Thomas Spencer (1833). The Encyclopædia Britannica: A Dictionary of Arts, Sciences, and General Literature. Vol. V (9 ed.). New York: Henry G. Allen and Company. p. 711.
41. Todd, James Henthorn (1864). St. Patrick, Apostle of Ireland, A Memoir of his Life and Mission. Dublin: Hodges, Smith & Co. pp. –497. It should be observed, however, that these years correspond to 492 and 493, a portion of the annals of Ulster being counted from the Incarnation, and being, therefore, one year before the common era of the Nativity of our Lord.
42. Heneage Elsley (1812). Annotations on the Four Gospels and the Acts of the Apostles (2nd ed.). London: T. Payne. xvi.
43. Félix Gaffiot (1934). Dictionnaire Illustré Latin-Français. Hachette.
44. Kaczynski, Richard (1 April 2009). The Weiser Concise Guide to Aleister Crowley. Weiser Books. p. 48.
45. Tracey R Rich. "Jewish Calendar". Judaism 101. Retrieved 18 May 2011. Jews do not generally use the words 'A.D.' and 'B.C.' to refer to the years on the Gregorian calendar. 'A.D.' means 'the year of our L-rd,' and we do not believe Jesus is the L-rd. Instead, we use the abbreviations C.E. (Common or Christian Era) and B.C.E. (Before the Common Era).
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External links

• "From Our Readers: Ancient Manuscripts—How Are They Dated?". Awake!. Jehovah's Witnesses. 2009. Although A.D. (Anno Domini, meaning 'in the year of our Lord') and B.C. (before Christ) are used in lands where professed Christianity predominates, we have chosen to use the terms C.E. (Common Era) and B.C.E. (Before the Common Era).