Dequeue old script and style loaded by the Divi theme

jquery-ui-fix-divi.php

<?php
function load_divi_fix() {
	global $wp_scripts;
	wp_enqueue_script( 'jquery-ui-core' );

	// get registered script object for jquery-ui
	$ui = $wp_scripts->query( 'jquery-ui-core' );

	// dequeue old style and scripts loaded by the Divi theme
	wp_dequeue_style( 'et_pb_admin_date_css' );
	wp_deregister_script( 'et_pb_admin_date_js' ); // loades old jquery.ui.core.js, jquery.ui.widget.js, jquery.ui.mouse.js, jquery.ui.datepicker.js, jquery.ui.slider.js
	wp_dequeue_script( 'et_pb_admin_date_addon_js' ); // old jquery timepicker

	// load wp native scripts and latest jquery-ui-timepicker
	wp_enqueue_script(
		'jquery-ui-timepicker',
		'https://cdnjs.cloudflare.com/ajax/libs/jquery-ui-timepicker-addon/1.6.1/jquery-ui-timepicker-addon.min.js',
		array(
			'jquery',
			'jquery-ui-widget',
			'jquery-ui-mouse',
			'jquery-ui-datepicker',
			'jquery-ui-slider'
		),
		'1.6,1', true);

	// load a jquery ui theme matching current jquery ui version
	$protocol = is_ssl() ? 'https' : 'http';
	$url = "$protocol://ajax.googleapis.com/ajax/libs/jqueryui/{$ui->ver}/themes/smoothness/jquery-ui.min.css";
	wp_enqueue_style( 'jquery-ui-smoothness', $url, false, null );
	wp_enqueue_style(
		'jquery-ui-timepicker',
		'https://cdnjs.cloudflare.com/ajax/libs/jquery-ui-timepicker-addon/1.6.1/jquery-ui-timepicker-addon.min.css',
		array('jquery-ui-smoothness'),
		'1.6.1'
	);
}

add_action( 'admin_enqueue_scripts', 'load_divi_fix', 99 );

The code for for adding jquery-ui-smoothness is from http://snippets.webaware.com.au/snippets/load-a-nice-jquery-ui-theme-in-wordpress/