What do BC and AD mean? A guide to the calendar centered on Christ.

BC and AD in brief

BC means Before Christ. AD means anno Domini, a Latin phrase meaning in the year of the Lord.

So a date like 586 BC means roughly 586 years before the traditional Christian calendar point associated with the birth of Jesus. A date like AD 2026 means the year 2026 in the era traditionally measured from the birth of Christ. There is no year 0, which throws off the math by one. And no one is certain exactly when Jesus was born.

Punctuation is not the point. B.C. and A.D. are the same as BC and AD. Some style guides keep the periods, some drop them. The striking thing is how much of the world learned to number history around Jesus of Nazareth. And still does.

AD does not mean After Death

AD does not mean After Death. Although that answer seems plausible and is common in school hallways, it is wrong.

If AD meant After Death, the years between Jesus' birth and crucifixion would have nowhere to go. Instead, AD points to His coming: anno Domini, the year of the Lord. In older formal writing, AD often comes before the number: AD 2026. BC usually comes after: 586 BC.

There is also no year zero in the traditional system. The calendar moves from 1 BC to AD 1. That makes century math a little awkward. History often is awkward.

What about CE and BCE?

CE means Common Era. BCE means Before Common Era. They use the same numbering as AD and BC. AD 2026 and 2026 CE point to the same year. 586 BC and 586 BCE point to the same year.

Language like Common Era reaches back into early modern writing, including Johannes Kepler's use of a related Latin phrase in 1615. The abbreviations became more common in the 18th and 19th centuries, then much more widespread in the late 20th century.

Some people use CE and BCE in academic, public-school, Jewish, interfaith, or secular contexts because the labels feel more neutral. Christians do not need to panic about that. A changed label does not remove Jesus from history, and it does not ask a Christian to stop confessing Christ.

Why Christians should care, but not posture

A calendar date does not prove the gospel. You will not win an argument about the resurrection by pointing at the date on a receipt. But the calendar does quietly remind everyone that Christianity is not an abstract idea floating above the world. It is about something that happened in time, on a particular morning, and reset the count of our years.

Luke names rulers. Matthew names Herod. John says the Word became flesh. Paul writes, "when the fullness of time had come, God sent forth his Son." Comfort is part of it, but the gospel is not first a feeling. It is a report. Something happened, out in the open, on dusty roads, under real rulers, and the world has been counting from it ever since.

That matters on ordinary days. When prayer feels abstract, remember that God did not save us abstractly. Christ entered a counted world: taxes, roads, rulers, mothers, tables, wood, wounds, mornings.

If you are keeping a daily devotional rhythm with Chosen Portion, the calendar can become more than an appointment grid. It can become a small way of saying: this day belongs to the Lord too.

Try this with today's date

The next time you write the year, on a check, a form, a journal, stop on it for a second. For twenty centuries people have dated their letters, their wills, and their love notes from the same week in Bethlehem. You are doing it too, every time you fill in the year, whether the thought ever crosses your mind or not.

So let it cross your mind once. Let the number on the page double as a quiet confession: this ordinary, dated day belongs to the Lord as much as any feast day does. Then pray it plainly, no flourish required.

"Lord Jesus, meet me in this actual day, in this year counted from Your coming. Not the day I wish I had. The one in front of me. In Your name, amen."