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Einstein actually proved a way of time alteration. It isn't time travel per se, what it is is slowing the aging process. You get 2 25 year old twins, and shoot one off into outer space at 98% the speed of light. They let 5 years pass on the ship's onboard clock, then turn round and shoot back to earth. The twin who lands is 35 (5 years away, 5 years back0 but the one who stayed on earth is now 70. This is because the faster you travel, the slower time lasts.
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And if you attach one end of a wormhole to Earth, and the other to the spaceship, then when the ship comes back you could step through the 10 year old wormhole onboard and come out on Earth, 35 years in the past.