Sort Elementor Posts Widget posts by ACF Date Field

functions.php

<?php 

// Don't copy the php start code above. Copy from below.
// This uses the Elementor Custom Query Documentation for extending a post query: 
// https://developers.elementor.com/custom-query-filter/
// This sorts the Elementor posts widget by an ACF date field.
// Replace my_acf_date_field with your date field.
// Put event_filter in the Query ID field of the Elementor Post widget.

add_action( 'elementor/query/event_filter', function( $query ) {

 $query->set('orderby', 'meta_value'); 
 $query->set('order', 'ASC'); 
 $query->set('meta_key', 'my_acf_date_field');  

} );