DBConnection::getHistoryMaxDate PHP Method

    static function getHistoryMaxDate($DBconnection)
    {
        if ($DBconnection->connected) {
            $result = $DBconnection->query("SELECT UNIX_TIMESTAMP(MAX(`date_mod`)) AS max_date\n                                         FROM `glpi_logs`");
            if ($DBconnection->numrows($result) > 0) {
                return $DBconnection->result($result, 0, "max_date");
            }
        }
        return 0;
    }