Our perception of time is a fabrication in order to function in our world. Animals, insects, etc. perceive time according to how they must function in their world. Consider this: the past no longer exists, and the future is yet to exist. That leaves the present, but what is that, really? One can take any moment in time and shrink it infinitely…a second, microsecond, nanosecond, femtosecond, etc… so that there really is no period of time we can call the present. So if it is all a perception, we should have some choice around that perception.