Okay let me start by saying that I'm no scientist, not even sure I spelt it right

but let me say once and for all, time travel is impossible and that's the bottom line 'cos stone cold said so

Subject closed
This idea about one clock in space and one on the ground sounds good in theory but all it shows is that some other force affected the clock. The only time you could ever come close to thinking time travel is possible would be if you were to fall into a coma and then wake up 5/10/20 years later. To you it would seem like a second but whilst you're asleep, the world has aged by 5/10/20 years instead of you jumping into the future. It's very similar when you're in a deep sleep, you fall asleep and the next time you wake up 12 hours have passed, you haven't travelled into the future, you've just been lying around whilst the earth rotates and ages by 12 hours.
Anyone know where I can get my hands on some plutonium because I've already seen a Delorean for sale