Aside from the Scions and a few others in the know, most people do not know that a Calamity is when a shard is rejoined to the source. All they know is massive event occurs around the world causing death and destruction.

So would the calendar makers of Hydaelyn (since most people do not know it was called Etheirys and would still call it that) mark the Final Days as a Calamity and declare the 8th Umbral Era as having started?