What is the correct format to export dates with html5 to excel?

These are my dates in datatables (dd/mm/yyyy).

Then I export these dates with the excel button.

As you can see the dates are in the left side and excel treats them as a general format.

Then if I double click each row excel treats theam as date format (right side of the column)

and now I can use the date filters correctly

I tried dd/mm/yyyy and yyyy-mm-dd formats and it does not work I always need to double click on each row.
The only thing I need is not to use the double click again each row.