@freemo most probably the recorded history will stop with the Babylonian
@sgul @freemo Wikipedia says 7-day "weeks" go back to Babylonia, including one day a week for making offering to the gods and avoiding prohibited activities.
https://en.m.wikipedia.org/wiki/Babylonian_calendar
Of course, other systems since have used different approaches including the French Revolution attempting to create a decimal calendar of 10-weeks.
Most calendar systems are lunisolar with the sun's position determining year length and the moon's phase determining month length. Reckoning weeks was more or less optional and of little interest.
And since prehistory is, by definition, before anything was recorded we can only speculate from limited findings how, or even if, time was recorded. It seems likely that some tribal leader made scratches on something to tally lunar months and maybe solar years.
Im not so much curious how far back 7-day weeks go but how long the weekdays we know have been aligned. How long has Sunday fallen on Sundays.
My curiosity is about religious communities. They deem Sunday, or in some cases Saturday, as religious days.. but if you go back far enough did Sundays at one point in the past fall on what would have been a Tuesday?
I know we had a shift in dates and so when you hear an ancient date it sometimes isnt the correct date according to modern counting of dates (shifted by a few days)... I wonder if something similar happened with religious Sundays where in the past it may have been a different day shifted a bit.
@lePetomaneAncien @freemo seems like the result of some sort of a cyclical event.The Cannanite script and Babylonian obsession with measurement leading to the invention of the days of the week.