protected function _getLastModifiedTime(string $tableName) : string
    {
        $tableName = Inflector::camelize($tableName);

        $mc = new ModuleConfig(ConfigType::MIGRATION(), $tableName);
        $path = $mc->find();

        $mtime = filemtime($path);
        if (false === $mtime) {
            $this->abort('Failed to get file\'s last modified time');
        }

        // Unit time stamp to YYYYMMDDhhmmss
        return date('YmdHis', $mtime);
    }