About these "calamities" and "Astral/Umbral" eras...

[Exodus-E]

You know, ever since Patch 2.2 (with the introduction of Yugiri and the Domans), I started wondering...these people that come from continents far away from Aldenard never actually experienced what the Eorzeans call the "Astral"/"Umbral" eras, have they?

I mean sure, aside from Meracydia being invaded by the Allagans millennia ago, there is no (known) record of other continents being involved, or even being aware about events directly related to Eorzea, right?
Not even the most recent calamity that led into the 7th Umbral era (Bahamut being released and devastating most of the land).

In fact, are we even sure that their calendars are the same as the ones that Eorzeans use?
With the whole "Astral"/"Umbral" nomenclatures and dates?

I get the distinct feeling that, while Eorzea is indeed a very important location (considering that it's at the very center of Aetheric activities), not that many people outside it know or are aware of its history...then again, maybe the Domans were kind of isolated.

Thoughts?