Difference of Dates to calculate No. of Days

Hi,
I'm trying to do a date subtraction between a "Date-1" and a Date-2 . I did this a couple of times in the past in bw-3.5 but now when i try to do that in BI 7.0 it doesnot work.
I tried creating a formula variable using replacement path for the Date-1 and Date-2 .Then i created Formulae and Subtracted Date-1 & Date-2! I found this procedure online: http://www.sd-solutions.com/documents/SDS_BW_Replacement%20Path%20Variables.html which i used in past and worked sucessfully in bw-3.5
Now when i track the Report execution, in RSRT it seems that it is processing Dates as YYYYMMDD instead of DDMMYYYY.
So that formulae brings weird result.
What do i need to do?
for e.g. 8/29/2005 - 9/13/2005 = 84 days
which should be only 15 days.
Please advise.
Can i do that without SAP Exit.
i checked previous posts and there somewhere it was mentioned that i need to use function
"Datediff" and i cannot find that anywhere.

Does it work in 7.0?
8/29/2005 - 9/13/2005 = 84 days,
in my case it is doing like this -->
9/13/2005 = 20050913 & 8/29/2005=20050829
Hence 20050913 - 20050829 = 84
it is processing Date as YYYYMMDD and then using it for subtraction.
how to solve that in 7.0
I used replacement path variable to solve that.
replace ment path variable- replace variable with Infoobject.
then created formulae variable, replace value with Key
Created formulae and used "Date" Processing value as Date.
Thanking u

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