Forward time travel is easy, just build a spaceship that can accelerate constantly at 1g then fly off into space and back. Spend 40 years travelling and you'll arrive back at Earth around 60,000 years later.
At least as long as you don't go off course and end up at that terrible Planet of the Apes!
PS. Boingboing your edit post functionality is broken, if you're just making a spelling correction it complains that "Body is too similar to what you recently posted"