TimeHelper::getUserUtcOffset

public function getUserUtcOffset($userId)
{
	$userId = (int)$userId;
	if (!isset($this->usersUtcOffsets[$userId]))
	{
		$dateTimeServer = new DateTime('now', $this->createTimezoneByOffset($this->getServerUtcOffset()));
		$this->usersUtcOffsets[$userId] = $dateTimeServer->getOffset() + $this->getUserToServerOffset($userId);
	}
	return $this->usersUtcOffsets[$userId];
}