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One is "CE Marking" which is a compulsory marking found on many products sold within the European Economic Area (EEA). The word "common" simply means that it is based on the most frequently used calendar system: the Gregorian Calendar.
For example in Rome there were several different ways of giving a year based on such things as the year of the reign of an emperor, who the consuls for the year were, or the number of years from the founding of Rome.
"CE" found in this web site refers to the other meaning, the "Common Era." This meaning for "CE" is a synonym for "AD." The latter is an abbreviation for "Anno Domini" in Latin or "the year of the Lord" in English. BCE stands for "Before the common era." BC means "Before Christ," or "Before the Messiah." Both measure the number of years before the approximate birthday of Yeshua/Jesus.
Both measure the number of years since the approximate birthday of Yeshua of Nazareth (a.k.a. Designation of a particular year in BC and BCE also have identical values.
("in the year of the world") which dates events from the beginning of the creation of the earth as calculated through scripture.
Ancient civilizations such as Mesopotamia and Egypt based their calendars on the reigns of kings or the cycles of the seasons as set by the gods.
Those who oppose the use of the "common era" designation also seem to feel that the use of BC/AD is actually stipulated by the Bible or in some way carries biblical authority.
There is no biblical authority for BC/AD; it was created over 500 years after the events described in the Christian New Testament and was not accepted usage until after another 500 years had passed.
John the Baptist) is known accurately from the transitions among the chief priests in the Jeruaslam Temple as mentioned in the Bible.
The birth of Jesus is known approximately relative to his cousin John's birth.
Finally, one that should be mentioned, although almost certainly not the most commonly used, is the Jewish Calendar - we are now in year 5763 so I would suggest that it has been around a bit longer than A. Feel free to post corrections or additions by signing in or using the feedback form above.
Most people don’t know much about the history of our calendar, which is not surprising since it is not often important in our lives, but when it is brought up in this way it becomes necessary to explore it, and it’s actually more interesting than might be expected.
The use of BCE/CE certainly has become more common in recent years but it is not a new invention of the "politically correct" nor is it even all that new; the use of "common era" in place of A. first appears in German in the 17th century CE and in English in the 18th.