Basic maths: "Minuten - Minuten" will always be 0, so leave it away...
code:
Minuten = DateDiff("n", Datum1, Datum2)
Minuten = Minuten - Minuten - Minuten
=>
code:
Minuten = DateDiff("n", Datum1, Datum2)
Minuten = 0 - Minuten
=>
code:
Minuten = DateDiff("n", Datum1, Datum2)
Minuten = -Minuten
=>
code:
Minuten = -DateDiff("n", Datum1, Datum2)
=>
code:
Minuten = DateDiff("n", Datum2, Datum1)