Thre're at least a dozen ways to do that. :)
Here're a few of them

ldDate = DATE()
? CHRTRAN(DTOC(ldDate), "/", "-")
? TRANSFORM(DTOC(ldDate), "99-99-9999")
SET MARK TO "-"
? ldDate
SET DATE TO USA
? ldDate
...

>
>In my report there is a date field. I want to show that in the following format
>
>27-08-2004 instead of 27/08/2004.
>