Event filtering

class Custom_Events_Date_Range_Filter extends Date_Range_Filter
{

    public static function setup()
    {
        parent::setup(); // optionnal
    }

    public static function filter_main_query($wp_query)
    {
        global $typenow, $pagenow;
        /**
         * Override queries for bookings
         */
        if ($typenow == 'event') {
            if (
                is_admin() && $wp_query->is_main_query() && in_array($pagenow,
                    array('edit.php')) && !empty($_GET['date_from']) && !empty($_GET['date_to'])
            ) {
                $from = explode('/', sanitize_text_field($_GET['date_from']));
                $to   = explode('/', sanitize_text_field($_GET['date_to']));

                $from = array_map('intval', $from);
                $to   = array_map('intval', $to);

                if (
                    3 === count($to) && 3 === count($from)
                ) {
                    list( $year_from, $month_from, $day_from ) = $from;
                    list( $year_to, $month_to, $day_to ) = $to;
                } else {
                    return $wp_query;
                }

                $from_dt = $year_from."-".sprintf('%02d', $month_from)."-".sprintf('%02d', $day_from)." 00:00:00";
                $to_dt   = $year_to."-".sprintf('%02d', $month_to)."-".sprintf('%02d', $day_to)." 23:59:59";

                $wp_query->set(
                    'meta_query',
                    array(
                    array(
                        'key' => 'start_date',
                        'value' => array($from_dt, $to_dt),
                        'compare' => 'BETWEEN',
                        'type' => 'DATETIME'
                    )
                    )
                );
            }
        } else {
            $wp_query = parent::filter_main_query($wp_query);
        }

        return $wp_query;
    }
}
remove_action('plugins_loaded', array('Date_Range_Filter', 'setup'));
add_action('plugins_loaded', array('Custom_Events_Date_Range_Filter', 'setup'), 20);