Folder::getUpdateTime

static function getUpdateTime(VolumeFragment $fragment): ?BitrixMainTypeDateTime
{
	$folder = $fragment->getFolder();
	if (!$folder instanceof DiskFolder)
	{
		throw new ArgumentTypeException('Fragment must be subclass of '.DiskFolder::className());
	}

	$updateTime = $folder->getUpdateTime()->toUserTime();

	return $updateTime;
}