Ocean/Spectre measurement question

Hello,

I'm trying to setup an ocean expression for measuring the delay between two events. I want something like "measure the delay between when clock goes high and when output crosses a threshold (i.e. 50mV) ". In hspice I would use the trig-targ construct but I could not find something similar for ocean/spectre.

I tried using the cross function but that starts counting events at the beginning of the simulation and gets tripped by glitches which occur before the clock edge. I guess I'm looking for a way to delay the start of the search until the clock signal has toggled. Is there something like this available?

Thanks,

--Tavi