DateField::getTimestampForMobile

protected function getTimestampForMobile($value, int $timeZoneOffset): int
{
	if ($value instanceof DateTime)
	{
		$useTimezone = ($this->getUserFieldParams()['SETTINGS']['USE_TIMEZONE'] ?? 'Y') === 'Y';
		if (!$useTimezone)
		{
			return $value->getTimestamp() - $timeZoneOffset;
		}

		return $value->getTimestamp();
	}

	if ($value instanceof Date)
	{
		return $value->getTimestamp() - $timeZoneOffset;
	}

	if ($value instanceof \DateTime)
	{
		return $value->getTimestamp() - $timeZoneOffset;
	}

	return \MakeTimeStamp($value) - $timeZoneOffset;
}