Changing starting day of the week everywhere?

[roolo]

I see in examples/pictures/rm2_ddvk.planner.daily-with-cal/03_month.png , there is Monday the first day of the week. Is there an option to make it so everywhere in the PDF?

I tried to search in code for first and start, but closest I got, was weekstart in cfg/base.yaml which seems to refer to a week which will be the first in all the calendars.

[roolo]

What I thought is Sunday is week number. Sorry for confusion.