class.ilDclDatetimeRecordRepresentation.php

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<?php

class ilDclDatetimeRecordRepresentation extends ilDclBaseRecordRepresentation
{
    public function getHTML(bool $link = true, array $options = []): string
    {
        $value = $this->getRecordField()->getValue();
        if ($value == '0000-00-00 00:00:00' || !$value) {
            return $this->lng->txt('no_date');
        }

        return $this->formatDate($value, $this->user->getDateFormat());
    }

    protected function formatDate(string $value, string $format)
    {
        $timestamp = strtotime($value);
        switch ($format) {
            case ilCalendarSettings::DATE_FORMAT_DMY:
                return date("d.m.Y", $timestamp);
            case ilCalendarSettings::DATE_FORMAT_YMD:
                return date("Y-m-d", $timestamp);
            case ilCalendarSettings::DATE_FORMAT_MDY:
                return date("m/d/Y", $timestamp);
        }

        return $this->lng->txt('no_date');
    }

    public function parseFormInput($value): ?string
    {
        if (!$value || $value == "-") {
            return null;
        }

        return substr($value, 0, -9);
    }
}