hi
I have made a calandar and every 4 weeks i need a red tick line on the right of the cels.
So for 2017 the first line is on the weeknumber 3 than 7 than 11 and the last line for 2017 is in week 51
But when i change the year the lines must auto change
so for 2018 it must be week 3 7 11 15 and so on
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