Add jQuery UI datepicker to admin panel

maybe you include your scripts ui-core and picker too early. Use wp_enqueue script() to include on the right hook. You must not include ui-core, only datepicker!

example:

wp_enqueue_script( 'jquery-ui-datetimepicker', \
  $this->get_plugins_url( 'js/ui.datetimepicker.js', __FILE__ ), \
  array('jquery-ui-core') , 0.1, TRUE );`

any tutorials:

I use the datepicker on different plugins and works fine, but it is necessary, that the order is correctly.

tech