Userform auto fill dates in between

[hep]

Hello!
I am new to this with posting in forums, but I have got stuck right now.
I have this Userform with alot of datepickers, these are for different periods.

But i Want them to autofill the dates in between the dates I have choosen and transfer to the sheet example cell A1.
I have tried so many different programing codes but not even got close. Is there some VBA encoding that can do this for me.?

I am very greatful for the help, I have attached the file with the Userform (click the "button").

Kindregards
Henrik