-- My copy of On Basilisk Station is missing the page (it got printed with an ad instead) that answers that for a certainty, so I'm having to dredge it up out of my head, as the Honorpedia is being useless.
The entirety of human-colonized space adopted the convention of 'the moment the first interstellar colony ship left Earth is the first moment of a New Era, the Post Diaspora era, and basically every planet runs a set of clocks that keep track of however many seconds it's been since that moment, and a program that keeps track of when it is on Terra, and when it is on the ship's homeworld, and ships tend to synch their wake/sleep cycles to the day-length of their home planet, or to the Terran day if their home planet is close to it.
There's one... Interesting... world that still keeps to the Anno Domini calendar despite it being Totally Unsuited To Anything About Their World, this is... A Thing that nobody not from that world really understands.
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The entirety of human-colonized space adopted the convention of 'the moment the first interstellar colony ship left Earth is the first moment of a New Era, the Post Diaspora era, and basically every planet runs a set of clocks that keep track of however many seconds it's been since that moment, and a program that keeps track of when it is on Terra, and when it is on the ship's homeworld, and ships tend to synch their wake/sleep cycles to the day-length of their home planet, or to the Terran day if their home planet is close to it.
There's one... Interesting... world that still keeps to the Anno Domini calendar despite it being Totally Unsuited To Anything About Their World, this is... A Thing that nobody not from that world really understands.