if ( ! empty( $args['modified_after'] ) || ! empty( $args['modified_before'] ) ) {
            $args['modified_after']  = empty( $args['modified_after'] ) ? '0000-00-00' : $args['modified_after'];
            $args['modified_before'] = empty( $args['modified_before'] ) ? current_time( 'mysql', 1 ) : $args['modified_before'];

            $date_modified = "AND `date_modified_gmt` BETWEEN STR_TO_DATE('" . esc_sql( $args['modified_after'] ) . "', '%Y-%m-%d %H:%i:%s') and STR_TO_DATE('" . esc_sql( $args['modified_before'] ) . "', '%Y-%m-%d %H:%i:%s')";