Hi

The locale en_NZ has the first day of the week set to Sunday but it
should be Monday. Technically I think it's unset and defaults to Sunday.
For reference the correct "first day of week" can be found here:
https://www.unicode.org/cldr/charts/36/supplemental/territory_information.html
I've attached a one line fix that sets first_weekday to Monday.

Best regards
Rade