Filter by time in Routing Rule

I have a colleague that is trying to eliminate any HL7 transactions that have admit date/time of midnight from going to an downstream system within a routing rule. I have tried several different iterations of code trying to figure this out just in the routing editor. Without having to write an object script function is this possible?

((HL7.{PV1:AssignedPatientLocation.PointofCare}="D3")||(HL7.{PV1:AssignedPatientLocation.PointofCare}="D4"))&&(SUBSTRING(HL7.{PV1:AdmitDateTime.Time},9,12)!=0000)

Thanks

Scott Roth