Dreaming about death often represents change, transition, the "death" of a past self and the rebirth of the new, fear of the unknown. Dreaming out death and dying is not necessarily a bad thing. But it can represent fears, anxieties and personal insecurities. Graveyards are kind of like archetypal junk yards. The carry dead parts of ourself, prior hopes, desires, memories, aspects of personality - things that we out grew or learned to move past. By seeing the date in the future sense of his death your uncle was really looking into himself and saying there are parts of himself that he needs to bury inorder to move past them in life. And I don't mean bury as in supress something, but rather resolve it and let whatever it may be "die".
What I am curious about is there are any addition details you can gather about this "other person" who told when the death date was. That could have its own symbolism as well.
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