Date count

[miso.dca]

Hello guys,
I've learnt lost of stuff here, but this kind of problem is still way of my league
I just simple need to count different date, that means :

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how many different days is in this area? I've uploaded sample sheet for better understanding, thank you for any help !

[nilem]

Try this:

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[miso.dca]

I really dont understand how you did it, but it works so thank you very much !