All we need is a single universal Space-Time map that will tell the time (in any and all formats) at any point in space, taking into consideration, all the events caused by all the forces that cause existence, from the start of this universe. Then it can take the place of both, maps and clocks.
Just make sure it is memory safe. Oh and properly escape all queries. And also …
That should last us until we start exploring the space outside the universe.