The 2038 problems are going to raise from the integer used to store the Unix time. The maximum value that the signed, four byte Unix integer can reach is 2^16-1, and so when you put that into seconds from 1/1/1970 (The Unix Epoch time) you end up somewhere near January 2038 (leap-seconds and such will throw it off) when the variable will reach its highest value and then reset to zero, essentially setting time back to 1970. The same will happen with the Mac variable at around the same time.
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The 2038 problems are going to raise from the integer used to store the Unix time. The maximum value that the signed, four byte Unix integer can reach is 2^16-1, and so when you put that into seconds from 1/1/1970 (The Unix Epoch time) you end up somewhere near January 2038 (leap-seconds and such will throw it off) when the variable will reach its highest value and then reset to zero, essentially setting time back to 1970. The same will happen with the Mac variable at around the same time.