Piwik\Plugins\VisitTime\Columns\LocalTime::configureSegments PHP Method

    protected function configureSegments()
    {
        $segment = new Segment();
        $segment->setSegment('visitLocalHour');
        $segment->setName('VisitTime_ColumnLocalTime');
        $segment->setSqlSegment('HOUR(log_visit.visitor_localtime)');
        $segment->setAcceptedValues('0, 1, 2, 3, ..., 20, 21, 22, 23');
        $this->addSegment($segment);
    }