Departure time in isochrone API?

Hi,

Based on the following graphhopper blogpost - https://www.graphhopper.com/blog/2018/07/04/high-precision-reachability/ - if I’m not mistaken, it appears as if the isochrone API can be made to return data based on time of day?

I’m struggling to find an example of how to implement this on a locally running server with the isochrone or the spt endpoints, even on the isochrone-edgelist branch.

Is this supported easily or am I misinterpreting something? If it is possible, how is the traffic component implemented without having a GTFS file, and is there a simple method of including the departure time in the get request? I am only interested in the car vehicle type not pt.

Any help would be appreciated! Thank you.