Selected Answer
Hello furkanyildiz and welcome to the forum,
There are a few ways to accomplish this. I have added these methods to your sample file and have attached it below.
If the sheet name is not yet in column "A", you can run a macro to bring all sheets up-to-date (sheet "16.04.2025"). Another option is to create a Worksheet_Change event. This is code which will run on a worksheet when specific cell(s) change ("WS Change Event" sheet in attached file). This method requires this event code be added to each worksheet. And a non-VBA way is to put a formula in each cell in column "A" to input the sheet name when column "B" contains data (sheet 17.04.2025"). There is also a simple non-VBA way – use a simple formula in column "A" (sheet "18.04.2025")
If this solves things for you please mark my Answer as Selected
Cheers :-)