I think it's just one of those things that doesn't really make sense to anyone, but one way makes slightly more sense to some than others.
In reality there is no week end. The only periods that exist are days and years (and lunar cycles). Weeks are artificially constructed and it can begin and end whenever we want. I can see the sense in saying the week ends at the end of Sunday so the weekend is the bit before that. I can also see the sense in saying the week ends at the end of Saturday and the weekend is around that.
In reality there is no week end. The only periods that exist are days and years (and lunar cycles). Weeks are artificially constructed and it can begin and end whenever we want. I can see the sense in saying the week ends at the end of Sunday so the weekend is the bit before that. I can also see the sense in saying the week ends at the end of Saturday and the weekend is around that.