UK CALENDARS START ON A MONDAY FOR INVOICING
ISO 8601, the international standard for date and time formatting (adopted in the UK), defines Monday as the first day of the week. In invoicing Sunday seems to have been adopted recently and I can see from another thread this was deliberate, but this is NOT UK standard and our calendars adopt a Monday start so will confuse all UK users. Maybe adopt a setting where the user can define the setting instead of trying to suit the whole world...

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