> MacOS does use 64-bit time values, so there shouldn't have been a problem. But the "ls” command (and the Finder graphical application) do do some date arithmetic. I suspect that there is old code that is using a 32-bit variable, thus causing the incorrect display.

I was unable to reproduce that by bypassing unzip:

    % touch -t 210301010000 this
    % ls -l this
    -rw-r--r--  1 eesmith  admin  0 Jan  1  2103 this