Forget Everything You Think You Know About Time
Rovelli turned next to the idea that time flows in only one direction, from past to future. In other words the distinction between past and future, the growth of entropy over time, depends on a macroscopic effect—“the way we have described the system, which in turn depends on how we interact with the system,” he said. Which means that, third, in quantum gravity, you can have “a local notion of a sequence of events, which is a minimal notion of time, and that’s the only thing that remains,” Rovelli said.
Source: nautil.us