Open SQL (difference between 2 dates) - DATEDIFF function

Hello Experts,
In my DB I created a TABLE with a column "GIORNO" that contains dates (in format 'yyyy-mm-dd'). I need to get the difference between the current day and the most recent date inserted into the table.
I'm using a Java DAO class to execute a query.
My problem is that the function DATEDIFF(a,b) explained in help.sap.com (http://help.sap.com/saphelp_nw70/helpdata/en/d2/f61996bb5e11d2a97100a0c9449261/content.htm) is not accepted by my portal..
I wrote a query that contains DATEDIFF( MAX(GIORNO) , ? ) where '?' is the current date..
And my system return to me the error message:
SQL syntax error: the token "(" was not expected here (referring to the dateDiff '(' )
In some forum I found that someone uses DATEDIFF(a,b, getdate()) but it still does not work.....
Any suggestion??
Best Regards

Hi Andy,
thanks for your fast answer..
SYSDATE does not work because is an Oracle SQL function..
Anyway I think that the problem is the DATEDIFF function that is not recognised (infact the error message says that it does not expect the '('...
I show to you the error message using DATEDIFF(MAX(GIORNO), SYSDATE) :
HTTP/1.1 500 Internal Server Error
Connection: close
Server: SAP J2EE Engine/7.00
Content-Type: text/xml; charset=UTF-8
Date: Wed, 26 Sep 2007 13:29:02 GMT
Set-Cookie: <value is hidden>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ><SOAP-ENV:Body><SOAP-ENV:Fault><faultcode>SOAP-ENV:Client</faultcode><faultstring>java.sql.SQLException: com.sap.sql.log.OpenSQLException: The SQL statement "SELECT NOMESETTORE, DATEDIFF(MAX(GIORNO),SYSDATE) AS GIORNI FROM SRS_DATEINFORTUNI WHERE NOMEDITTA = ? AND NOMEAREA= ? GROUP BY NOMESETTORE ORDER BY NOMESETTORE" contains the syntax error[s]: - 1:29 - SQL syntax error: the token "(" was not expected here</faultstring><detail><ns1:getGiorniSettori_com.akhela.giorniSenzaInfortuni.ejb.exception.GiorniSenzaInfortuniException xmlns:ns1='urn:GiorniSenzaInfortuniWSWsd/GiorniSenzaInfortuniWSVi'></ns1:getGiorniSettori_com.akhela.giorniSenzaInfortuni.ejb.exception.GiorniSenzaInfortuniException></detail></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope>

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