I created an App, where the user has 2 Datepickers to save 2 Date Strings in the two sharepoint list columns "Start_Date" and "End Date" (Both of the columns are String datatype) with the function : Text(DatePicker1.SelectedDate,"[$-en-GB]dd/mm/yyyy") and Text(DatePicker2.SelectedDate,"[$-en-GB]dd/mm/yyyy") .
I also created a Calendar.
Do you have an Idea, how i can get all of those Dates Strings between these 2 Dates and put them in the calendar by changing the fill color or making a label visible or etc.
Not with the default calendar controls. You would have to create your own (the power apps user gallery might help you to not start from scratch, e. g. https://powerusers.microsoft.com/t5/Community-App-Samples/PowerApps-Calendar/m-p/1632395 might be already enough since you could add the dates to mark as "holidays")
Depends a little on how you created your calender then. You can work with the DateDiff function with your current date and the start and end date. If the current date is larger or equal to start and lower or equal to end, then it should be highlighted.
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