Created ad bc dating system
Years were often reckoned from the foundation of Rome ('ab urbe condita').
The traditional date for the foundation was the year that we now call 753 BC. In the later Roman empire years were sometimes numbered by reference to 'indictions' (15-year periods instituted by Diocletian for tax purposes).
BCE/CE is simply a change in label, designed to The use of BCE/CE could be considered 'political correctness', especially since it is hardly common outside of academic circles.Replacing it with "Common Era"/"Before Common Era" reinforces the notion of a global, common epoch starting at the height of the Roman Empire.When "Christian Era" is used, it's still clear what epoch is being referred to (i.e.Personally I always thought it was MORE culturally insensitive.BC is "before christ", whether you believe in him or not.
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Modern dates are understood in the Western world to be in the Gregorian calendar, but for older dates writers should specify the calendar used.