How to allow multiDatesPicker in wp admin post type?

try now this code
<?php  function load_requirements() 
{
        wp_register_script('mdp', 'https://cdn.rawgit.com/dubrox/Multiple-Dates-Picker-for-jQuery-UI/master/jquery-ui.multidatespicker.js');
        wp_enqueue_script('mdp');
}
add_action('admin_head', 'load_requirements');?>


 jQuery(document).ready(function($) 
 {
   $('.datepicker').multiDatesPicker();
 });