How to select values in range between two calendars?

[#1]

Hello, I have a problem to make a selection of dates in a ListBox on a specific range.

I have a table with a Date field "DateField" and a value field "Value".
2 Calendars:
1) start date
2) end date
for the specification of the range.
The button should select dates in the specified range (start-date:end-date). In the sample it only selects a fixed date. How can I fix the button to select the specified range values?

[Gysbert_Wassenaar · Accepted solution]

See here for a very good tutorial.

[#3]

Thanks a lot Gysbert, the tutorial is very useful and your answer is what I needed.