Common era dating system

Neither notation includes a year zero, and the two notations (CE/BCE and AD/BC) are numerically equivalent; thus "2016 CE" corresponds to "AD 2016", and "400 BCE" corresponds to "400 BC".

The Gregorian calendar and the year-numbering system associated with it is the calendar system with most widespread use in the world today.

Interestingly, this Ngram chart of word usage over two hundred years supports the suggestion that the expression Common Era became much more established towards the end of the 20th century.For decades, it has been the global standard, recognized by international institutions such as the United Nations and the Universal Postal Union.The expression "Common Era" can be found as early as 1708 in English, and to 1635 in English as Vulgar Era.It is no surprise, then, that they began to use the same method of dating for both their religious timekeeping and secular events. There have been several suggestions to pick an earlier starting point, which would enable a single system to address all of history.Joseph Scaliger proposed Julian Era dates, from 4713 BCE.