Difference between two dates

[Bad_QlikDeveloper99]

Hello everyone,

I´d like to get the difference of two dates in days. I tried the Interval-function, but after using it, the result was only '-'.
I am using the following function: 

Interval(V_BelegKopf.Pruefungsdatum - V_BelegKopf.BelegDatum,'D')

Could somebody help me, please?

[Vegar]

It could be that your ...datum fields are not recognised as dates. 

Once you ensured that then your expression  or just num(V_BelegKopf.Pruefungsdatum - V_BelegKopf.BelegDatum, '0') should give you what you want.

[BrunPierre]

Try

=Floor(Num(V_BelegKopf.Pruefungsdatum - V_BelegKopf.BelegDatum))