Hi,
as it turned out, I had just finished a big data management project with DataTables, and of course had used datepicker for one of its functions.
I believe I would be able to help you fix your problem quickly enough. However, I will set the time to be 2 days to count for time difference between countries.
Also, from the code you post, I think you are using AJAX GET to create a dynamic view. I would suggest using AJAX POST instead, so that user won't have to see or manipulate the datepicker data ('2020-02-02'), which might result in a bad security hole.
Hope to hear from you soon,
Vu Huong