Common era dating system
It was not actually developed until 525 AD, when the entrance of the Christ into the world was recognized as being the turning point of history, and our calendars were made to reflect that.3 In regard to the use of BCE and CE, these are more recent developments.
In most usages, BCE stands for “Before the Common Era,” and CE stands for “Common Era.” BCE is used in place of BC, and CE is used in place of AD.
It includes the year "0" and eliminates the need for any prefixes or suffixes by attributing the arithmetic sign to the date.
Thus, the astronomical date for 2000 CE is simply 2000 or 2000.
In recent years, some historical scholars have advocated the use of the religiously neutral abbreviations BCE (for "Before Common Era") to substitute for "BC," and "CE" (for "Common Era") to replace "AD." These secular terms are both used as suffixes making them better suited to computer generated tables.
In spite of these deficiencies, the dating system devised by Exiguus is now too deeply ensconced in the Western world to easily change.
"Common Era" has no real meaning, and even the origin of this term is unclear.