When I change starting and ending date  at
edit product details -> reservation calender -> calender configuration
after changing it, when refreshed, the value in the date fields always reverts back to the default values(current date). Below is the link to that page.
http://demo-store.apps.nextdata.io/Admin/Product/Edit/5b3d725cb3949c230cc0457a

Hello,

If I understand well, it's ok and it's expected behavior. You need to generate calendar first, after that, fields with dates are not used.

Best,
Patryk