What day do you consider to be the first day of the week? To me, it’s always seemed natural that it’s Monday (because that was the first day of the school week, I suppose), but for some people, it’s Sunday. This seems odd to me, given that Sunday is part of the weekend (note the word end in there). And there’s also the fact that the Bible talks about God resting on the seventh day. But of course this only works if Monday is the first day; for those of Jewish faith, the rest day, or Sabbath, is Saturday.
Of course, most of the time none of this really matters – we just get on with what we have to do on Monday, Tuesday and so on. Confusion arises, though, if, during a chat on Friday, someone starts talking about their plans for ‘next week’ and then refers to ‘Sunday’; I’m thinking about over a week away, but they might mean in two days’ time. And if we’re supposed to be meeting up, that could be disastrous. So, to be on the safe side, remind your students to always specify the date as well as the day!