@Luke.369 There is truth without lies, but you're right... we would call it something else. If there was no false information, true information would exist, but it would just be information. There wouldn't be a contrast to information, so you would naturally presume there would be no such thing as contradiction, or... imagination. But if you want to speak relativity... everything is relative to everything. How 1 minute passes to me, is not the same for how 1 minute passes to you, even if we were side by side. How a car's engine sounds depends if you're in the vehicle, or stationary as it passes by. Even gravity differs ever so slightly depending where you are on Earth. The amount it differs is so insignificant however, you cannot feel it, and it doesn't affect our measurements.
I however, still think this time traveller is probably seeking attention and isn't being completely honest and open, which begs the question of why he's even here. If he is telling the truth, if not to entertain himself. Sure seems that way.
P.S. You can use the edit button to revise your comment if you make an error. But yes, I suppose there's no light without lime for that Rush song 'Limelight'. But I did figure out through context you meant time. Freudian slips are hilarious. You say one thing, but mean your mother.