About AD, BC, what does it mean in history to say BC, BC

Yes, but with the word "ancient". It was before 2209.

Distinguish it by the legendary date of the birth of Jesus. It was preceded by BC and followed by AD.

That is, before the first year of the Common Era；or before common era, abbreviated as BCE, as: 221 BC, 8 BC, etc. XX BC, also referred to as "the first xx years".

The so-called 2014 A.D. is the 2014th year from the first year of A.D., and 2017 B.C. means the 2017th year before the first year of A.D. It is important to note that there is no such thing as 0 BC and no 0 AD. The year after 1 B.C.E. is the first year of the Common Era (i.e., 1 A.D.).

The years of the Common B.C. are counted backwards. For example, the Western Han Dynasty was founded in 202 BC, and the Qin Dynasty was founded in 221 BC, which was later in 202 BC than in 221 BC. Note, however, that the months of the B.C. years are still counted upright, with January before and December last.

The same is true for the dates, with the first day of the new year before and the fifteenth day after.

In fact, BC is the current Gregorian calendar we use now, because the current Gregorian calendar was promulgated and implemented by the Pope, so the year of Jesus' birth is the first year of AD, and before the first year of AD is BC, we are now 2015, that is, the 2014th year after the birth of Jesus.

The so-called 2013 A.D. is two thousand and thirteen years from the first year of A.D., which means two thousand and thirteen years ago.

It should be noted that there is neither 0 BC nor 0 AD, and the year after 1 BC is the first year of AD (i.e., 1 AD).

The Common Era is the Western way of saying it.

The Chinese generally set the year by the emperor. For example, how many years and how many years is Kangxi?

But in line with international standards, after the overthrow of the imperial system, we also adopted the Common Era.

When is A.D. 0? It was the day Jesus was born.

The next year of the Common Era is roughly equivalent to every year of the reign of Emperor Wu of the Han Dynasty.

Hello, dear, happy to answer your questions. Common Era (AD) and BC (BC) are chronological methods used by Western civilization. A.D. refers to the period from the first year of A.D., while B.C. refers to the period before the first year of A.D.

For example, 476 B.C. refers to the year 476 before the first year of the Common Era. The year 476 refers to the year 476 from the 1st year of the year. In Western countries, the Common Era is often used to denote the number of years since the modern era, while BC is used to denote a period before the modern era.

It should be noted that although the chronology of Chawan A.D. and B.C. was used in Western culture, the chronology used in ancient China and other civilizations was different.

The differences between BC and AD include different chronological methods, different starting points, different years, different calculation methods, different forms of numerical expression, different historical periods, and so on.

1. There are different ways to talk about the big year.

The BC year is shown by the BC table, and the AD year is represented by AD.

2. The starting point is different.

The starting point of the BC and the Common Era is different, the BC is the year of the birth of Jesus, while the Common Era is the beginning of the Roman Emperor Caesar's decision to use the year of the birth of Jesus as the starting point when he revised the calendar.

3. The year is different.

The year of BC and AD are different, the first year of AD is the year of AD, and the first year of BC is the last year of BC.

4. The calculation method is different.

The years of BC changed from large to small, while the years of Common Era changed from small to large.

5. The form of digital expression is different.

1 BC, recorded as -1 year, and 1 AD, recorded as 1 year.

6. Different historical periods.

BC belongs to the ancient period, and AD belongs to the modern period.