gistfile1.txt

class OpeningPeriodStrategy implements StrategyInterface, TranslatorAwareInterface
{
    use TranslatorAwareTrait;

    /**
     * @param Campsite $campsite
     * @return Information
     */
    public function getInformation(Campsite $campsite)
    {
        $periods = $campsite->getPeriodsByType(CampsitePeriodType::OPENING);

        if (count($periods) <= 0) {
            return new NullInformation();
        }

        return new Information(
            $this->getTranslator()->translate('Opening period'),
            $periods
        );
    }
    
    public function defaultFormat($value)
    {
        $periods = [];
        foreach ($value as $period) {
          $periods[] = $period->getFromDate()->toString('d/m')
                          . ' '
                          . $this->getTranslator()->translate('until')
                          . ' '
                          . $period->getToDate()->toString('d/m');
        }                        
        return implode('<br/>', $periods)
    }
}