How to Calculate Sum of Difference between two dates

Hi,
I'm using BI Publisher in Siebel CRM.
In RTF template I have the following expression to calculate the Difference between dates
<?xdoxslt:date_diff( 'd' , psfn:totext(CIRGSubmittedDate,"yyyy-MM-dd","MM/dd/yyyy"), psfn:totext(Done,"yyyy-MM-dd","MM/dd/yyyy"), $_XDOLOCALE, $_XDOTIMEZONE)?>
The above expression works for me to calculate the dates.
I need to calculate the Sum of all these dates for a Group.
Want to know the Syntax for Sum function using Date_diff.
Tried the following and didn't work.
<?Sum(xdoxslt:date_diff( 'd' , psfn:totext(CIRGSubmittedDate,"yyyy-MM-dd","MM/dd/yyyy"), psfn:totext(Done,"yyyy-aMM-dd","MM/dd/yyyy"), $_XDOLOCALE, $_XDOTIMEZONE))?>
Not sure what I'm doing wrong here...
Anyone please help...
Thanks
PV

Hi
To break the diff between 2 dates into days, hours, minutes, sec -- you can use the following:
select to_char( created, 'dd-mon-yyyy hh24:mi:ss' ),
trunc( sysdate-created ) "Dy",
trunc( mod( (sysdate-created)*24, 24 ) ) "Hr",
trunc( mod( (sysdate-created)*24*60, 60 ) ) "Mi",
trunc( mod( (sysdate-created)*24*60*60, 60 ) ) "Sec",
to_char( sysdate, 'dd-mon-yyyy hh24:mi:ss' ),
sysdate-created "Tdy",
(sysdate-created)*24 "Thr",
(sysdate-created)*24*60 "Tmi",
(sysdate-created)*24*60*60 "Tsec"
from all_users
where rownum < 50
HTH
RangaReddy

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To break the diff between 2 dates into days, hours, minutes, sec -- you can use the following:
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