private function determineSymfonyState()
    {
        $now = new \DateTime();
        $eom = \DateTime::createFromFormat('m/Y', Kernel::END_OF_MAINTENANCE)->modify('last day of this month');
        $eol = \DateTime::createFromFormat('m/Y', Kernel::END_OF_LIFE)->modify('last day of this month');

        if ($now > $eol) {
            $versionState = 'eol';
        } elseif ($now > $eom) {
            $versionState = 'eom';
        } elseif ('' !== Kernel::EXTRA_VERSION) {
            $versionState = 'dev';
        } else {
            $versionState = 'stable';
        }

        return $versionState;
    }