Week changes on Sunday, must be Monday! It shows now, on 01.01.2018, week 0 which is not existing! On Sunday, 31.12.2017, it showed week 53 which is also wrong.
Yes, please help somebody! It's driving me nuts, i tried to use the {dw} + 1 but it seems I'm not allowed to, I don't get all the lua script and how are you supposed to type all of that on your phone in the little box.