Hi.
In my humble view, divination is based on what enters our awareness. So in theory any time you use is fine.
In practice, however, there are things more suited for us. If we don't look for them and choose something, with time that will likely start to work as well. But that initial suitability is always better found out by itself.
What I usually do for new divination systems is try not to force the answer. Get a few questions, can even ask the system to provide it in the more natural way for you. Then observe what it seemed to have provided, after the situations have ended and you know how they developed.
If you see it was using local solar time for a specific system, yet different time for another, then using that seem likely a good idea.
For me, since I'm using the relation of branches to solar time it won't make much sense to use time in other countries or clock time.
For example Sun at highest position = Wu horse.
For good part of the other time, Zi is midnight, Mao is Sunrise and You is Sunset...
Stuff like that is important. Espesially the connection of Mao to Sunset, as some stuff in other systems(8 mansions for example) can't really be explained without that.
(for example why the Images of the stars are what they are).
Anyway, short answer - worth doing some questions without thinking of specific time for it to show, or even specifically asking it to answer in the time that is most suited for you. Then reverse engineer what it answered. If it seems it used Chinese time then by all means, wise to do the same. If it used Solar - then same idea.
If it used time you didn't thought of, wise to see how to get that time, may be interesting pointer from the system for roots or something else. : )
