Cron\Schedule\CrontabSchedule::checkPart PHP Method

    protected function checkPart($partName, $min, $max, array $formats, \DateTime $now)
    {
        if ($this->parts[$partName] != '*') {
            foreach ($this->parseRule($this->parts[$partName], $min, $max) as $value) {
                foreach ($formats as $format) {
                    if ($now->format($format) == $value) {
                        return true;
                    }
                }
            }
            return false;
        }
        return null;
    }