I tried the first solution, and I saw that the report is already set up for datetime fields.
some technical information about my problem:
I have a table with some fields
(for this example - 4 fields: date, varchar2(10) and 2 fields of timestamp). My purpose is to find the different between the two dates.
The problem is that when try to create the SQL expression, the crystal knows only the 2 first fields, and don't know the timestamp fields. I can use "cast" or even just show that field. In the formula editor, I get the message "no errors found", but when I try to drag the formula into the report, the crystal crashes, and closed.
about the version - I fo have version 8.5.
I hope it's anough.
Michal.