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Time can 'slow down' or 'speed up' compared to what we are used depending on how fast we are taveling. If I was to travel for 1 light year and come back to earth, only one year of my life would pass, but people here on earth would experience much more time in that frame.
As far as going backwards, it does not seem logical to me.
As far as going forwards, if it was possible to get near a black hole but not go in, it might be possible to travel into the future in terms of what was the current universe like before you entered and when you came out.
Thats about all I know.
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"Only two things are certain: the universe and human stupidity; and I'm not certain about the universe."
-- Albert Einstein
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