$Date = JFactory::getDate($timeStamp);

	public function setLastVisit($timeStamp = null, $userId = null) {
        // Check for User ID
        if (is_null($userId)) {
            if (isset($this)) {
                $userId = $this->id;
            } else {
                jexit('No userid in setLastVisit');
            }
        }

        // If no timestamp value is passed to function, than current time is used.
        $config = JFactory::getConfig();
        $fusoHorario = $config->get('offset');
        $date = JFactory::getDate($timeStamp, $fusoHorario);

        // Update the database row for the user.
        $db = $this->_db;
        $query = $db->getQuery(true)
                ->update($db->quoteName($this->_tbl))
                ->set($db->quoteName('lastvisitDate') . '=' . $db->quote($date)) // In this line, there was a function that formatted the date to sql "$ date-> toSql ();" Which in my case was advancing at 2, the hours saved in my DB
                ->where($db->quoteName('id') . '=' . (int) $userId);
        $db->setQuery($query);
        $db->execute();
        return true;
    }

}