I mean, if today i.e. is Sunday then someone long time ago should have said "Today will be Sunday" for the first time in a period from today that is multiple of seven.
I was assuming that it was Pope Gregory XIII in October 1582, but looks like he is not. I failed in googling and duckduckgoing out the answer, so I ask for Lemmy's collective wisdom!
EDIT: so question is not about the origin of 7-day week and sequence of weekday names, but about the exact reference point (day) of today’s weekday countdown. From when have people stopped adding or ommiting any adjustment 'out-of-week' days (like in Babylon or Rome) and kept counting to seven till today? In other words, there should be a point exactly N x 7 days ago from which the 7-day countdown has not been interrupted. Or at least the earliest known day in history that everyone on Earth agreed upon as a reference point
EDIT 2: Solved by https://lemmy.world/comment/1852458
Thanks everyone!
For a smooth run this meta requires an ok commander and good PUGs, to ensure both, join a couple GW2 discord servers like Hardstuck, where they frequently announce the runs with good comms, who place food & banners and give instructions along the way of progressing meta. If you join a random squad and a comm doesn't sort it into parties, go away at once, nothing good will happen :)
Go to the map early and do random events all across the map, at least 5 of them, so you'll be able to open more chests at the very end. Events give decent loot and EoD currency too.
I also recommend watching a Youtube guide for this meta, because it has a couple of particular phases, where you just need to know what to do, much like the Octovine.
So, with some effort it really can go from annoying mess to engaging and rewarding experience.