Hi @TomiJoe ,
Do you mean that your formula works when your browser's language is English, but doesn't work when your browser's language is German?
Could you tell me how do you set varKW and the data type of Kalenderwoche?
If you set varKW by using this formula: Set(varKW,Weekday(Today())), then varKW is a number value.
In this situation, you need to make sure Kalenderwoche field is number data type too. Or else, the formula will not work.
Please check these things:
1)set a gallery's Items:
Filter(Zeiterfassung;varKW=Kalenderwoche;User().Email=Titel)
If this work, then the filter part has no problem.
That should be ClearCollect function not works in German language.
2)set a gallery's Items:
Filter(Zeiterfassung;Kalenderwoche=7;User().Email=Titel)
If this work, then Kalenderwoche is number type. Please check whether varKW is number type.
3)set a gallery's Items:
Filter(Zeiterfassung;Kalenderwoche="7";User().Email=Titel)
If this work, then Kalenderwoche is text type. Please check whether varKW is text type.
To sum up, if formula1 works that should be ClearCollect problem.
If formula2 or formula3 works that should be variable problem.
If formula1, formula2,formula3 all not works, that should be Filter function problem.
Firstly,find the where the key problem is. Then modify your formula based on this.
If the problem still exists, the problem maybe not about your formula, maybe the region server.
In this situation, I suggest you ask for help here:
https://powerapps.microsoft.com/en-us/support/pro/ticket/
Best regards,