Time model for studying evolving systems

Approaches to the determination of model time in studies of developing systems are discussed. The possibility of setting the global time of the system using the local times of its elements, understood as protocols of events in which they participate, is shown. Combining all such protocols leads to a partial order of events. It is proposed to use this order as the global time of the system. The correctness of such a definition of time is shown, as well as the fact that it is well combined with the use of an event control mechanism in simulation models.