When I was a kid, I was always taught to refer to years using BC (Before Christ) and AD (Anno Domini / year of our Lord). However, I somewhat regularly hear people referring to years as in the CE (Common Era) or BCE (Before the Common Era).

Why do people use the latter terminology? For one thing, I find it confusing. It doesn't help that BCE is similar to BC. But moreover, there is only one letter of difference between the two terms, whereas with BC and AD, the terms are clearly different and I find it easier to distinguish! Were BCE/CE established earlier than BC/AD?


6 Answers 6


BCE/CE usually refers to the Common Era (the years are the same as AD/BC). That is, BC is usually understood to mean "Before the Common Era" and CE to mean "Common Era," though it is possible to reinterpret the abbreviations as "Christian Era."

The simplest reason for using BCE/CE as opposed to AD/BC is to avoid reference to Christianity and, in particular, to avoid naming Christ as Lord (BC/AD: Before Christ/In the year of our Lord). Wikipedia, Anno Domini article:

For example, Cunningham and Starr (1998) write that "B.C.E./C.E. …do not presuppose faith in Christ and hence are more appropriate for interfaith dialog than the conventional B.C./A.D."

If there is a standardization or shift occurring, it's likely toward BCE/CE, at least in the United States. Common Era notation is used in many schools and academic settings.


There are a few issues with BC/AD:


A.D. 1 was first calculated in the first millenium based on available knowledge at the time. Later on, it was found Jesus likely wasn't born that year, but a few years earlier (i.e., in the somewhat ironic 3–4 B.C. area). Marking it as the "Christian Era" (or more commonly, the "Common Era") allows the same epoch to be used even though the best calculation for Jesus's birth has changed.


While Christians make up a very large chunk of the world's population, they are no where near the majority. Most organizations and political entities, for the sake of convenience, have adopted the Western calendar, but "Anno Domini"/"Before Christ" are meaningless terms. Replacing it with "Common Era"/"Before Common Era" reinforces the notion of a global, common epoch starting at the height of the Roman Empire.

When "Christian Era" is used, it's still clear what epoch is being referred to (i.e. the Western one) without having to have some special knowledge about what "anno domini" means or who Christ is.

Calendar confusion

Wikipedia also mentions an issue with the Julian Calendar and the Gregorian Calendar historically both using AD/BC, leading to some confusion as to which calendar system is being referred to:

The terms "Common Era", "Anno Domini", "Before the Common Era" and "Before Christ" can be applied to dates that rely on either the Julian calendar or the Gregorian calendar. Modern dates are understood in the Western world to be in the Gregorian calendar, but for older dates writers should specify the calendar used. Dates in the Gregorian calendar in the Western world have always used the era designated in English as Anno Domini or Common Era, but over the millennia a wide variety of eras have been used with the Julian calendar.

Switching to CE/BCE makes it clear the Gregorian calendar is being used.


Personally I always thought it was MORE culturally insensitive.

BC is "before christ", whether you believe in him or not. It's just as good as the Nth year of reign of Pharaoh Whoever - doesn't require you to believe in the deity of a particular egyptian

Whereas making it "common era" implies that it's the correct one and all the others are wrong.

Archaeologists also use BP - before present - which is confusingly set as 1950. Astronomers of course have the best solution - just count days.

  • 2
    Common does not imply correct to me at all. Considering that the Gregorian calendar is the most widely used civil calendar in the world, it is perfectly accurate to label it the Common Era (or perhaps more accurately, the Commonest Era). And while before Christ may not require you to believe in Christ, it is historically inaccurate, and in the year of the Lord does rather imply a belief that Jesus is the Lord and discount other faiths. Commented Jan 30, 2019 at 11:00
  • BC implies that Jesus as a historical figure (regardless of his historicity) is Christ. There would be far fewer problems if it was BJN instead, for Before Jesus of Nazareth.
    – forest
    Commented Feb 23, 2019 at 8:20
  • 1
    @forest, yes this was discussed in a long comment thread that seems to have been deleted/moved to chat
    – mgb
    Commented Feb 25, 2019 at 20:19
  • It is the reference to an event that is the problem. You can label it anything you want to, but it simply does not change the facts that it refers to an event that is marked by the birth of Jesus. So, anyone that wants to be offended will be offended because this particular event was chosen to mark the two eras. If we don't want to offend anyone, we should really use something like the extinction of the dinosaurs or perhaps even the eruption of Vesuvius.
    – Alexander
    Commented Dec 19, 2023 at 12:35

While this issue always seems to get mired in arguments about political correctness, I'd offer another perspective. I switched to BCE/CE before I was even aware of the political correctness issue: I had previously found the whole BC/AD confusing, so when I happened upon the new abbreviations in a scholarly source and then looked them up, to me, it made a lot more sense for stylistic reasons.

Here are just a few problems with BC/AD:

  1. They're inconsistent. BC is an abbreviation of the English phrase before Christ, while AD is an abbreviation of a Latin phrase anno Domini. It's very strange that going across the arbitrary division line between two years also requires a change in the language of abbreviation. Also, traditional convention says that BC comes after a date (e.g., 1200 BC, or year 1200 before Christ), while AD comes before the year in a date (e.g., AD 1200, or anno Domini 1200, which follows English style of in the year of Our Lord 1200). While that convention is no longer universally maintained, it's odd and confusing.

  2. They're prone to misinterpretation. In particular, the language inconsistency noted above has given birth to a widely-held misconception that AD is an English abbreviation for after death (i.e., after the death of Christ). Obviously this is wrong, but it was actually the first explanation I heard as a child, which then caused great confusion when I encountered a teacher telling me that it meant something else in some obscure dead language. I'm not alone in having heard this false etymology, as many internet discussions will attest.

  3. They're literally wrong. As noted in a previous answer, the birth of Jesus Christ is now estimated by most scholars to have occurred at least a few years earlier. (I've seen everything from 7 to 2 BCE -- and yes, in this particular sentence, using the abbreviation BC seems to me an oxymoron.) In any case, "common era" solves this problem by just admitting that we're using a common convention, which even Christian scholars now widely regard as inaccurate. But it's still a convenient and "common" way of referring to our "era" of year reckoning. Insisting that we hold onto the older style too seems to be promoting ignorance of the fact that the abbreviations are literally false.

  4. They cause confusion. One item of confusion occurs because of the erroneous after death etymology above. (I distinctly recall asking someone about this when I was a small child: "So how do they number the years while Jesus was alive?" No answer.) But even if we understand what AD means, the convention can create confusion even when Christian scholars are trying to refer to, well, the years around the time of Jesus Christ. Because we know the birth year is off, any date in the first century BCE or CE is automatically a bit offset compared to the reference point that BC/AD uses. Dates in the early Church are a bit uncertain anyhow, but if a Christian scholar is trying to relate a possible date to the timeline of Jesus Christ's life, you have to do a little conversion in your head. Whenever I see BC/AD with a year within a few decades of Jesus's purported lifespan, I tend to think of an imaginary (sic) appended afterward. In other words, when a reference to the timing of Christ's birth should have maximum usefulness due to proximity of the dates, it actually breeds confusion.

Any one of these reasons alone wouldn't be enough to argue for a new convention. After all, there are all sorts of inconsistent and illogical stylistic elements in English usage. But when you take into account that the old meanings are widely believed (even by Christians) to be actually wrong, you now have a convention that's actively creating confusion.

BCE/CE still recognizes the implicit (though erroneously calculated) division point in eras. You still can't explain the reckoning of BCE/CE without referring to Jesus Christ (even if it's coupled with "And there was this monk guy named Dionysius who got it wrong..."). And aside from the minor point mentioned in the question that they look a little too alike compared to BC/AD, I think there's a strong argument for stylistic and logical advantages.

  • 3
    I have another take.. If it ain't broke don't fix it. Do people really think that switching to CE will not cause more confusion than AD? If the numbers before are exactly the same then it is more confusing using 2 sets of these indentifiers than 1.
    – ycomp
    Commented Aug 14, 2018 at 4:07
  • I too was thought AD stood for “After Death”. Plus one for this reference and /or added insight. Commented Apr 18, 2019 at 7:32

Europe and its former colonies have already standardized on BC/AD. As the world has also standardized on or at the very least have an alternate calendar (as in many Muslim countries), BCE/CE are modern inventions to avoid Christian-centric notions.

BCE/CE is simply a change in label, designed to

  • preserve dates
  • be easy to remember (being so close to the original BC/AD)
  • recognize that other, more populous, non-Christian cultures use this dating system

The use of BCE/CE could be considered 'political correctness', especially since it is hardly common outside of academic circles.

Anyway, you don't need to worry, BC/AD has not lost at all to the metric system or Kwanzaa, it is still very much what is used and recognized (but I haven't looked at any high school history books lately).

Note that the labeling BC/AD was introduced in the 6th century...um... AUC, which superseded the year style based on the founding of Rome ( AUC stands for Ab Urbe Condite (http://en.wikipedia.org/wiki/Ab_urbe_condita)).

  • The problem is though, I've heard people from the west using it too.. There should be one standard in each country. Next thing you know they'll start changing textbooks and brainwashing students that way. I wouldn't be surprised if it has already begun.
    – ycomp
    Commented Aug 14, 2018 at 4:12

I had understood BCE to mean "Before the Common Era" and CE as "Common Era", which was successful in removing Christianity from the year naming system. Well, successful in that the name changed, but not so successful since the numbers are still exactly the same, and still have an end and start at the traditional year of the birth of Christ.


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