Think about what it is like to live in a simulation. For you, time passes normally. But the computer simulating you could run faster or slower than the "simulated" time. And the execution could be even suspended at times, and then resumed at a later time. You might even reverse time in a simulation. For you, it would not feel any different because you are inside the simulation. So there is no way of telling whether you are in a simulation that is running forwards from last Tuesday, or backwards from next Tuesday. And actually you can't even tell a difference between a simulation that is not run at all, as long as the laws governing the simulation are deterministic.