Week numbers in my calendar are different than in NotePlan?
NotePlan uses ISO week numbers and adjusts them by the first date of the week which is selected in your NotePlan preferences. This means the week numbers in NotePlan could differ from other calendar apps you are using, such as Apple Calendar.
If you want to have the same week numbers in other calendar apps as in NotePlan, you can change the calendar type in the system preferences > "Language & Region" (or in the preferences of the other calendar app) to "ISO 8601":
