The "basic" format for year 0 is the four-digit form 0000, which equals the historical year 1 BC. Several "expanded" formats are possible: −0000 and +0000, as well as five- and six-digit versions.

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.

Common Era (CE) and Before the Common Era (BCE) are year notations for the Gregorian calendar (and its predecessor, the Julian calendar), the world's most widely used calendar era. Common Era and Before the Common Era are alternatives to the original Anno Domini (AD) and Before Christ (BC) notations used for the same calendar era.

公历纪元 （英語： Common Era， 縮寫 為 CE），又稱作 公元 、 西历纪元 、 西元，是當今 國際 社會最為廣泛使用的 紀年 標準。 其源於西方國家使用的 基督纪年，以當時認定的 耶穌 出生之后的那一年為紀年的開始 [註 1]，尽管目前学界普遍认为耶穌並非出生于如今所说的公元1年。 目前现行的公历是 格里历。 公历纪元的第1年稱作“公元1年”或“公元元年”，前一年称作“公元前1年”，没有“公元 0年 ”。 公元紀年起源於 基督教 的影響。 公元525年，基督教 神學家 狄奧尼修斯·伊 …

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.

2018年9月4日 · 现代由于西历纪元的通用和标准化，为避免非西方、非基督徒的反感，英语的”纪元前”和”纪元后”常分别用”BCE”和”CE”来代表；”CE”是”Common Era”的缩写，意为”公元”，而”BCE”是”Before the Common Era”的缩写，意为”公元前”。

以前在英文里「纪元前」是用B.C.来代表，「纪元后」是用A.D.来代表；B.C.是Before Christ开头字母的缩写，意思是「在基督诞生之前」；而A.D.则是拉丁文Anno Domini开头字母的缩写，意思是「我们活在主的时代」。

公元前（Before Christ或Beforethe Common Era，缩写B.C.或BCE），公元元年以前时间的统称，是当今国际社会通用纪年标准公历纪元（Common Era，缩写CE）引出的相对时间概念。 公元前最初代表耶稣出生之前的时代，尽管目前学界认为耶稣可能并非诞生于公元元年。

Since we mark years from a set point known as 1 — there is no year 0 — 3500BC was 5513 years ago. Non-Christians often use the term CE in place of AD. CE refers to “Common Era,” “Current Era,” or “Christian Era.” BCE can describe the era preceding the Common Era.

The year 1 BC/BCE is numbered 0, the year 2 BC is numbered −1, and in general the year n BC/BCE is numbered "− (n − 1)" [1] (a negative number equal to 1 − n). The numbers of AD/CE years are not changed and are written with either no sign or a positive sign; thus in general n AD/CE is simply n or + n. [1] .