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> I personally detest calendars which display Monday as the first day of the week, and am genuinely curious why ISO chose that.

I think ISO chose it because there was considerable difference between countries as to what the first day of the week in usual calendar presentation was when ISO 8601 was being considered, they needed something consistent, and it just happened to shake out to Monday.

Looking at https://en.wikipedia.org/wiki/Names_of_the_days_of_the_week#..., it appears that almost every language which numbers the days of the week starts on Sunday, with the exception of some Slavic languages (which use Monday) and Swahili (which uses Saturday).

The Chinese language family is a pretty big one, at least in terms of population. They all start numbering with Day One as Monday.

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