Thank you very much, that was the right hint.
As it is a Rest Service that does not contain a CSP in the path, I had to edit the default path directly. But that is not a problem in my scenario.

Kind regards 

Armin

Intersystems REST Api for Metrics

For anyone who wants to take a look at the api 

Thank you, for the other direction, this can be used

SET dateint=$PIECE($ZTIMESTAMP,",",1)
SET timeint=$PIECE($ZTIMESTAMP,",",2)
set ntts = (((864000000000*87657)+(dateint*864000000000))+(timeint*10000000))
w ntts