date not getting refreshed after scheduled refresh

I have a transaction table that has two date columns: transaction_date and days_since_transaction(current date - transaction_date).  The values in  days_since_transaction column arent getting updated with the scheduled refresh in the power bi service. The formula    i'm using is: duration.days((datetimezone.utcnow())-[transaction_date]. 

Any idea how to resolve this ?