User::setOffline

static function setOffline($userId = false)
{
	global $USER;
	if (!$userId)
	{
		$userId = $USER->GetId();
	}

	$userId = intval($userId);
	if ($userId <= 0)
	{
		return false;
	}

	if (BitrixMainLoader::includeModule('im'))
	{
		CIMStatus::Set($userId, Array('MOBILE_LAST_DATE' => null));
	}
	else
	{
		CUserOptions::DeleteOption('mobile', 'lastActivityDate', false, $userId);
	}

	return false;
}