How can I add the condition with aggregated calulated field

[kiara]

I want to add 

max(if([Service.Service Code Raw] = 'H0046' ,[Service Payor.Date of Service]))) > (max(if([Service.Service Code Raw] = 'H0031' or [Service.Service Code Raw] = '90791',[Service Payor.Date of Service])))

into

max(if([Service.Service Code Raw] = 'H0031' or [Service.Service Code Raw] = '90791',[Service Payor.Date of Service]))

[kiara]

I tried this way. But I am getting blank space.

=if(
date(aggr(max(if([Service.Service Code Raw] = 'H0031' or [Service.Service Code Raw] = '90791')) , (max(if([Service.Service Code Raw] = 'H0046' ,[Service Payor.Date of Service]))) > (max(if([Service.Service Code Raw] = 'H0031' or [Service.Service Code Raw] = '90791',[Service Payor.Date of Service])))))
,[Service Payor.Date of Service])