"At 15:30:08 UTC on Sun, 04 December 292,277,026,596 AD, the Unix time stamp will exceed the largest value that can be held in a signed 64-bit integer.[84]"
i like that they give a precise time and date, given that the Gregorian calendar is basically meaningless on such scales. (also neither the earth nor the sun will still be around in any recognizable form....)