WordPress - Event Post Type Slug from date

functions.php

<?php /* EVENT SLUG FROM DATE*/

function event_slug($post_id, $post, $update)
{
    if (get_field('date', $post_id)) {
        $date = get_field('date', $post_id);
        $slug = date('ymd', strtotime($date));
        if ($post->post_name != $slug) {
            remove_action('save_post_event', 'event_slug', 10, 3);
            wp_update_post([
                'ID' => $post_id,
                'post_name' => $slug
            ]);
            add_action('save_post_event', 'event_slug', 10, 3);
        }
    }
}
add_action('save_post_event', 'event_slug', 10, 3);