For example, I see you declare a datepicker (
<div data-kt-daterangepicker="true" data-kt-daterangepicker-opens="left" ... >).
What is the "original" datepicker you have used? I know to get the StartDate and EndDate of the selected date.
We are using daterangepicker plugin. You can find examples of usage in our documentation. https://preview.keenthemes.com/html/metronic/docs/forms/daterangepicker.
daterangepicker and other plugins are connected in file _keenthemes/tools/webpack/plugins/plugins.js.
Keenthemes Support Team