One of the hard problems we already had to handle was that Unix used long also for file sizes. So if nobody would use 64-bit types early on to break the 4G barr

One of the hard problems we already had to handle was that Unix used long also for file sizes. So if nobody would use 64-bit types early on to break the 4G barrier on storage, then obviously, nobody would do it for time. Even the 32-bit Unix versions shipped with this limitation for a very long time.