It's going to be centuries until the difference between astronomical midnight and UTC midnight is more than an hour, which is the exact same amount of error we

It's going to be centuries until the difference between astronomical midnight and UTC midnight is more than an hour, which is the exact same amount of error we deliberately inflict on ourselves to have more daylight in summer evenings and half the error that residents of Spain experience by as a consequence of the political decision to join the same time zone as Berlin. If human civilization exists long enough for this to be an actual problem, we're probably going to have to figure out how to coordinate time with multiple space settlements, which is going to be a much harder problem thanks to time dilation.