I recall that in A Deepness in the Sky by Vernor Vinge, a space sci-fi set in the far future, they're still using Unix time underneath many many layers of abstr

I recall that in A Deepness in the Sky by Vernor Vinge, a space sci-fi set in the far future, they're still using Unix time underneath many many layers of abstractions, and with their cultural context they guess that humanity must have set it to start with the moment mankind first travelled into space to land on the Moon.