Range Calendar: Get first and last displayed date

[vbackeberg]

I have a range calendar that I want to get the first and last date from to make a backend query with that date range.

Does RangeCalendar expose any information on the date range it displays?
The placeholder date can help me get the first displayed date, but I am not sure how to get the last displayed date.

I have looked at this post which mentions a monthsVisible. That property is no available on the rangeCalendar, though.
#1379