The Future Temporal Definite. Used when the future is fixed, as it is your personal past, yet is the relative future because of your time traveling endeavors. Example: I will have been eating cake. The Future Present Past personal Specified. When the traveller uses the present and past tense but the tense is made future by the addition of a future date. Example: Im starving! I haven't eaten since Tomorrow. There are lots of others Im sure, such as tenses that would describe actions happening in the speakers past but the listeners future and vice versa. Also there would be a few tenses describing thing you were doing in the future but were interrupted by something that you needed to attend to in the past. Or things that you did in the past which affected the future, so in fact never happened, except in your timeline. Its pretty complicated. Then there's the issue of paradoxes.......