Board Thread:General Discussion/@comment-26907577-20191002153041/@comment-32182236-20191126213343

We haven't found out what the monster calendar is, but it's likely not ours.

A real possibility is that it's based on the founding of the monster kingdom.

This is why over in another thread where I mentioned the calendar disrepencies, I've used PF when talking about the monster calendar:It stands for "post-founding".

(I previously used AF, but it got confused with AD. D and F are right next to each other, after all.)

But we're not sure what the monster calendar is actually based on.

Either way, Chara fell in 201X PF (or whatever the monster calendar actually is), and maybe the early 1900s AD.

If the trend is reversed, then it might explain why there was an unusually long gap from the last human to Frisk, without a need for the wizard hypothesis. Though there might still be other evidence for this hypothesis.