if ($equal_to || is_null($direction)) {
                $parts['start'] = $parts['end'] = DateTimeObj::get('Y-m-d H:i:s', $string);
            } else {
                $parts['start'] = DateTimeObj::get('Y-m-d H:i:s', $string . ' - 1 second');
                $parts['end'] = DateTimeObj::get('Y-m-d H:i:s', $string . ' + 1 second');