How was the day of the week we live today decided?

by PleaseBanShen

As in: someone decided that the week would be Monday-Sunday (or Sunday-Saturday), but who declared for the first (last?) time: "TODAY IS MONDAY".

I hope this isn't a really stupid question, thanks a lot guys

Searocksandtrees

hi! there's always room for more input on this, but meanwhile, get started on this section of the FAQ*

Weeks, weekdays, and weekends

*see the link on the sidebar or the wiki tab