jQuery(document).ready(function($){
      var startDateTextBox = jQuery('.event_start');
      var endDateTextBox = jQuery('.event_end');
      jQuery.timepicker.datetimeRange(
        startDateTextBox,
        endDateTextBox,
        {
          minInterval: (1000*60*60), // 1hr
          dateFormat: 'yy-mm-dd', 
          timeFormat: 'HH:mm',
          start: {}, // start picker options
          end: {} // end picker options         
        }
      );
    }); 
  jQuery('.event_more_date').datetimepicker({
    dateFormat: 'yy-mm-dd', 
    timeFormat: "HH:mm"
     // minDate:0
  });