>>>>
>>>>You didn't accidentally multiply or divide, instead of subtracting?
>>>>
>>>
>>>No.
>>>
>>>>Also check the field width in the report, and the numeric format, e.g. "###" will show asterisks if you have four digits.
>>>
>>>I have no choice to specify how many digits to be printed in the column. Just the width of the column. But the values are very small (no more than 4 digits). And in fact when I was using simple DATE_FLD1 - DATE_FLD2 as an expression the number were showing without any problem. It is when I get the DATE_FLD1 - DATE_FLD2 from within IIF() the number are super large. Strange ...
>>
>>How about a cast().
>
>The same result, a bunch of asterisks. Thank you.

Do you have any .Null. values?