About this old answer of @PieterGeerkens ' ...

I don't wanna get overly chatty directly on the answer, but I don't think the equation of Zeus and Thor comes out of nowhere.

I actually had professors in college (that's a whopping 3 decades ago), refer to them as "the Indo-European sky god".

I believe the implication of that is that at some point in history the PIE people had a sky god that both those god's evolved out of.

However, I kind of get the sense that idea was tied to the idea that aboriginal (non-Indo-European) people they took the land from had gods that were more earth-based, and those were still vesigally in the new people's mythos as minor elder gods (eg: the Titans).

..and was also tied into the idea that such people tended to be matriarchal rather than the Indo-European's patriarchal. (Female gods and earth and fertility being a natural pairing)

I believe the latter view is now highly out of favor, so I wouldn't be surprised if the entire rest of that package is as well.

IIRC the Germanic descendant of the PIE sky deity (Jupiter/Zeus) is Týr

I can buy an ancient correspondence between Thor/Tyr and Zeus/Jupiter; but the seven day week is much newer than that would have to have been.

PIE were hypothesised to be a sky religion people and a seven day week and lunar calendar work together "neat"ly. IIRC lunar calendars are useful for cow-cultures as they are for more sedentary cultures.