extract 2 dates in query editor

Hello Power BI community,

I am new to Power BI and want to extract 2 dates out of 2 columns in the query editor and add in to a new colomn.

When I do this I want to it like this: Date 1 - Date 2 = lead time in days, but Power BI gave an error on the operator: -. I tried to do this with the measure datediff(date.1;date.2) too, but did not work either.

Is anyone that can help me I would be very pleased!

Thanks in advance!