[JockoManning]

*
Sonday is the 7th day on Chinese calendars. Or used to be.

[WildHighlander57]

JockoManning wrote:

“*
Sonday is the 7th day on Chinese calendars. Or used to be.”

Some Scottish calendars also; I had bought one when I went to the Old Country back in the mid-90’s.

And note the reference to the ISO standard 8601 saying Sunday is the 7th day:

https://www.timeanddate.com/calendar/days/sunday.html

https://www.telegraph.co.uk/comment/letters/6495398/Officially-Sunday-is-not-the-first-day-of-the-week.html