Substract Year Week from each other

[ingo_lsg]

Hi experts,

i want to substract year.weeks from each other.

e.g.

2020.01 - 2019.52 = 2 weeks

or the other way round 2020.01 - 2 weeks = 2019.52

Especially, when it comes to year changes I am not sure how this can easily be achieved.

Do I have to use date conversion?

Thanx in advance

Ingo