What is this CE and BCE dating system that I've seen used throughout this book?

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Bibliographic Details
Published in:Religion in five minutes
Main Author: Hughes, Aaron W. 1968- (Author)
Format: Print Article
Language:English
Check availability: HBZ Gateway
Fernleihe:Fernleihe für die Fachinformationsdienste
Published: Equinox 2017
In: Religion in five minutes
Year: 2017, Pages: 293-298