292billion AD is where 2^63 seconds from 1970 would get us - eg, what we'd get if we just converted the existing epoch to 64bit. This is why I call nanoseconds

292billion AD is where 2^63 seconds from 1970 would get us - eg, what we'd get if we just converted the existing epoch to 64bit. This is why I call nanoseconds a 'free' feature - it's clear it's time to solve the '2038 problem' now - and simply moving to a 64bit timestamp would solve that. But rather than solving this problem for the next 292 billion years, we can make better use of the timestamp today. So, as you say, providing nanosecond granularity for the next 500 years, being more useful than one-second granularity for the next 292 billion.