How can we check empty DateTime fields.

[M. Asif Hussain]

 How can we check in a Calculation field script if another DateTime field is empty? To avoid undefined calculation results.

I have tried something like this:

if(     length(#{datetime of arrival})==0,           ,datediff(now(), #{datetime of arrival})    )

[Er Mo]

Hallo

Wenn ein Feld Leer ist gibt es den Wert " null "( Diese 4 Buchstaben )  zurück .

Hello
If a field is empty it returns the value "null" (these 4 letters).