ilCertificateDateHelper.php

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<?php

declare(strict_types=1);

class ilCertificateDateHelper
{
    public function formatDate($date, ?int $dateFormat = null): string
    {
        if (null === $dateFormat) {
            require_once 'Services/Calendar/classes/class.ilDateTime.php'; // Required because of global contant IL_CAL_DATE
            $dateFormat = IL_CAL_DATETIME;
        }

        $oldDatePresentationValue = ilDatePresentation::useRelativeDates();
        ilDatePresentation::setUseRelativeDates(false);

        $date = ilDatePresentation::formatDate(new ilDate($date, $dateFormat));

        ilDatePresentation::setUseRelativeDates($oldDatePresentationValue);

        return $date;
    }

    public function formatDateTime($dateTime, ?int $dateFormat = null): string
    {
        if (null === $dateFormat) {
            require_once 'Services/Calendar/classes/class.ilDateTime.php'; // Required because of global contant IL_CAL_DATE
            $dateFormat = IL_CAL_DATETIME;
        }

        $oldDatePresentationValue = ilDatePresentation::useRelativeDates();
        ilDatePresentation::setUseRelativeDates(false);

        $date = ilDatePresentation::formatDate(new ilDateTime($dateTime, $dateFormat));

        ilDatePresentation::setUseRelativeDates($oldDatePresentationValue);

        return $date;
    }
}