Both don't exist the past or future, though Astrophysics can talk about projecting a particle or proton into the past, we are a living organism and there's no credible literature of humans being projected into the past, save Tesla that claimed he had a time machine invention to do that. The future is not here and science fiction as in Star Trek is great for entertainment, watching them teleport to other dimensions in past and present, but reality is that type of machine don't exsist.
