At this point we're bound by two unavoidable realities:

1: Game content is still in the same bubble, we have very recent references to the Calamity still being five years ago.

2: Every player who attempts to make a timeline will do so based on what feels right to them, meaning that - while everyone agrees we've spent more than a year in the game - no one agrees on how much more.

That's where I stop thinking about it any deeper than that; it's not worth it. Every player gets a blank check and should confidently cash that in for whatever they want.

Personally, I also divide each patch's content into however long there is until the next patch. It feels natural to my brain and, more importantly, probably feels natural to the developers as well.