> Generally in a software system you can't count on a time source to move forward, to move in consistent intervals, or to move at all. By way of illustrating t

> Generally in a software system you can't count on a time source to move forward, to move in consistent intervals, or to move at all. By way of illustrating this point: C++ has std::chrono::system_clock, std::chrono::steady_clock, and std::clock, all of which give different guarantees on how the clock behaves.