The denomination 1 BC for this year has been used since the early medieval period when the Anno Domini calendar era became the prevalent method in Europe for naming years. The following year is AD 1 in the widely used Julian calendar and the proleptic Gregorian calendar, which both do not have a "year zero".

As the name suggests, BC or Before Christ refers to the number of years before Christ was born. AD or Anno Domini is the period after Christ was born. BCE and CE stand for 'Before Common Era' and 'Common Era' and are alternatives to BC and AD respectively.

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。

The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero ; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1".

Year 1 BC/BCE was a leap year starting on Thursday in the proleptic Julian calendar. Some sources list it as a common year starting on either Friday or Saturday. At the time, it was known as the Year of the Consulship of Lentulus and Piso.

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. This practice was first suggested in the sixth century A.D., and was adopted by the pope of that time. It took quite a while for it to become a worldwide standard, however.

2015年1月14日 · 以前在英语里“ 纪元前 ”是用“ BC ”来代表，“ 纪元后 ”是用“ AD ”代表；“BC”是“Before Christ”（“基督前”）的首字母缩写；而“AD”则是拉丁文“Anno Domini”（“主的年份”）的缩写。

公元前纪年方式如：公元前1年、公元前2年……公元前xx年，也简称为“前xx年”，对应英文表示为BC 1、BC 2……BC XX。 随着年份数字增加，其表示的年代距今更久远。

What's the difference between AD and BC? AD or A.D. stands for Anno Domini and is a label for numbering years after Christ was born. BC or B.C. means Before Christ. The year Christ was born is considered AD 1 and the year before that is labeled 1 BC. Historians use a …

2023年9月15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。