BC means ' Before Christ ' and AD stands for ' Anno Domini ', a Latin term which means 'Year of Our Lord' in English. The BC/AD dating system was created with respect to the birthdate of Jesus Christ, which is considered the central starting point. As the name suggests, BC or Before Christ refers to the number of years before Christ was born.

The terms anno Domini (AD) and before Christ (BC) are used when designating years in the Gregorian and Julian calendars.

2025年2月5日 · BC 是 Before Christ 的缩写，意为“基督诞生之前”，用来指“公元前……”，也叫“主前……”，如654 BC，公元前654年。 AD 即 Anno Domini ，出自拉丁语，意为“in the year of the Lord”，即“主的元年”，用来指“公元……”，如AD 2017，公元2017年。

200,000 B.C. Homo sapiens, the first modern humans, appear in Africa. 62,000 B.C. Bow and arrows with stone points (arrowheads) are used. 30,000 B.C. Cro-Magnon man is flourishing, moving from the Near East into Europe, lives by hunting and gathering. Cro-Magnon’s painted caves with drawings of the animals they killed.

In the modern calendar, we label all years with B.C. (before Christ) or A.D. (anno domini, or "in the year of our lord"). There is no "zero" year -- in this system, the year Christ was born is 1 A.D., and the year preceding it is 1 B.C.

CE is an abbreviation for Common Era. It means the same as AD (Anno Domini) and represents the time from year 1 and onward. BCE is short for Before Common Era. It can be used instead of BC (Before Christ) and stands for the time before year 1. CE and BCE are used in exactly the same way as the traditional abbreviations AD and BC.

BC stands for 'Before Christ' and refers to all the years before the birth of Jesus Christ. The numbers go backward from year 1, so 500 BC is earlier than 200 BC. AD stands for the Latin phrase 'Anno Domini', which means 'in the year of our Lord'.

2023年8月14日 · AD stands for Anno Domini, which is Latin for in the year of the Lord. It’s a way of counting years based on the estimated birth of Jesus Christ. BC stands for Before Christ, and it’s a way of counting years before the estimated birth of Jesus Christ. AD starts with year 1 and continues to the present day.

2024年10月24日 · "B.C." stands for "before Christ." The system labels years based on a traditional notion of when Jesus was born — with "A.D." denoting years after his birth and "B.C." designating...

2013年4月26日 · The meaning of AD is Anno Domini or Year of our Lord referring to the year of Christ’s birth. The meaning of BC is Before Christ. CE is a recent term. It refers to Common Era and is used in place of A.D. the dates are the same i.e., 2009 AD is 2009 CE. BCE means Before Common Era. For example 400 BC is 400 BCE.