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human
[Chrono Trigger] Why is every date in the game followed by BC or AD, when Christianity doesn't seem to exist in the Chrono Trigger universe?

I've been playing through Chrono Trigger recently and have noticed that all the dates in the game are followed by either BC (Before Christ) or AD (~~After Death~~ Anno Domini). The problem is that the game doesn't seem to take place on Earth (at least not as we know it) and there are never any other references to Christ or Christianity.

Additionally, in the game's story Crono is a figure analogous to Christ, who dies to save humanity and is later resurrected, seeming to further suggest that Christ wouldn't exist in this universe.

So where to the BC and AD used to denote dates come form? And before someone says that BC stands for "Before Crono", I should point out that Crono sacrifices himself 12,000 years before year zero.
gpt
Just a quick clarification, 'AD' doesn't stand for 'After Death'. It stands for Anno domini, which is Latin for 'Year of Our Lord. 

There isn't a 33 year long gap between 1bc and 1ad *(there's also no year 0)*