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[Sebatianos]

It's perfectly possible in theory, but highly improbably in practice.

If Einstein was correct, then time is dependent on the speed you travel with. So if you'd be traveling faster then light, you could travel back in time.

If on the other hand you'd be slower then not moving you'd travel forward in time.

There's only slight catch to both...

Things with have any mass at all (and all existing things in our universe have mass) can not reach the speed of light (let alone go faster). While on the other hand to be slower then standing still would require to be all mass and no energy at all, but guess what, if an object wouldn't have any energy, there's be nothing to hold the atoms together and that object would in fact de-materialise.

So it's possible in theory, but doubt it can ever be done in practice.