Earlier quoted context omitted.
> Per my knowledge US is the only country which stubbornly (and illogically) considers Sunday to be the first day of the week /Officially/ almost everyone has standardized on ISO 8601 where Monday = 1 and Sunday = 7. But unofficially, not really. The week is still popularly understood to start on Sunday in English Canada, and probably some other parts of the English-speaking world. A quick check of Wikipedia suggests…
> .. considers Sunday to be the first day of the week How can the first day of the week happen in the middle of the weekend !?!
One is the starting weekend, and the other the ending weekend.