Number of days between 2 dates

[#1]

Hi.

I am very new in Qlikview, I would like some assistance calculate  number of days between 2 dates and exclude nulls in that expression.

I did this on my expression in  straight table with Supplier as my dimension

date#(GirGrvOrderDate-GirPrefDelDate)  however its diving nulls on some values.. how can I remove nulls on expression

my goal is to trace how many days was my supplier late for delivery

Thanks

Deli(SA)

[pradnyat]

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