Q u o t e: you can NOT measure time.....our idea of time is numbers..and these numbers measure "distances" in time... you can not put a physical attribute to an "hour" of time .....how can a computer measure time in order to travel it? it can't and is impossible. it has no physical matter to calculate other then numbers...you can not measure a dimension that has no physical property
this makes targeting a caption of time wether future or past not possible
Of course you can measure time, you even tell us how: With numbers! If you think that numbers are not "real enough" or something, you can't measure anything. It is a ridiculous argument.
The problem with the thread starters assumption of "proof" has been discussed before. Some say that there will never be Time Travel, because as of today there has never been a report of a Time Traveler anywhere. However, since Time Travel would be extremely dangerous, it would probably be forbidden. And even if someone returned, they would possible either create a new strand of time (many-worlds-theory), which we, as inhabitants of the strain could not possibly notice.
Time works like a clockwork, one gear moving the other, the first one determining how the last one moves. This would suggest that a Time Traveler would be unable to change the past and all his actions would inevitably lead to the future that He knows as History.
And in any case. If someone told you they were a Time Traveler, would you believe them?
But, ah, I digress. To return to the logical fallacy that the Thread Starter opens up for us.
If I finished the blueprints for a Time Machine now and told myself "Hell I am coming back to this moment once I built it, just to tell myself that I can!", that does not mean I would actually do it.
Because, once I built it, I have actually no reason to go back anymore, unless I have witnessed FutureMe visiting me before. Why? Because I obviously did not need FutureMe to convince myself of the possibility of my plan.
Anyway, if you are smart enough to build a Time Machine, you would know that it is far too risky to use it to travel to The Past... ;)