I've a slight problem with the datediff() SQL function.

Code:
Select 
DATEDIFF(day, Startdatum, getdate()) AS aantal_dagen,
DATEDIFF(Hour, Startdatum, getdate()) AS aantal_uren,
DATEDIFF(Minute, Startdatum, getdate()) AS aantal_minuten,
DATEDIFF(Month, Startdatum, getdate()) AS aantal_maanden,
(DATEDIFF(Minute, Startdatum, getdate()) % 60) as minuutje,
((DATEDIFF(Minute, Startdatum, getdate()) - (DATEDIFF(Minute, Startdatum, getdate()) % 60)) / 60) as uurtje
FROM Bla
I'd like to get the Years / Months / Days / Hours / Minutes from the calculation...
When I do the DATEDIFF(Minute, Startdatum, getdate()) I only want the real minutes....not like 500...but 8 hours and 20 minutes...