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Fri 8 Apr, 2016 01:01 pm
I'll start it with the Gregorian calendar.
https://en.wikipedia.org/wiki/Pope_Gregory_XIII
BC/AD, important dates in history, evolution,
@cicerone imposter,
And what happpened the year Pope Gregory XIII died
https://en.wikipedia.org/wiki/1585
Keeping the topic of calendars going, here is the Chinese calendar which predates Gregorian.
http://www.timeanddate.com/calendar/about-chinese.html