This is the part that's not behaving as expected:

W $ZTIMEH("12:05:38.975411826")
Output: 338

On my instance I get Output: 43538.975411826

$ZTH takes a 2nd argument that specifies the time format.  If you omit that value it uses the default, which you can see with this:

WRITE ##class(%SYS.NLS.Format).GetFormatItem("TimeFormat")

I suspect you'll get 3 or 4, since those are the formats for 12 hour clock.

Try sending 1 or 2 for 24 hour clock:

W $ZTIMEH("12:05:38.975411826", 1)

https://docs.intersystems.com/iris20241/csp/docbook/Doc.View.cls?KEY=RCO...

Assuming this is code that runs outside of a Production and is trying to invoke a Business Service that does run within a Production in the same Namespace, the approach would be generally like this:

1) Create an instance of the Business Service:

    set tSC = ##class(Ens.Director).CreateBusinessService(tServiceName, .tServiceInstance)

2) Invoke the Business Service:

        set tSC = tServiceInstance.ProcessInput(tRequest, .tResponse)

This technique is used for SOAP services, REST APIs, and Tasks that invoke functionality provided by a Production.

Will that work for Object Script?  Don't we need to save before we can compile and even find out if there are errors?