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I would argue for both fixed UTC based on atomic clocks, and 86400 seconds per day - at the expense of rotation of Earth not being in sync with UTC or calendar boundaries.

It will take 3000 years before leap seconds add up to an hour, but most countries adjust the clocks that much every year for DST. It will take 40000 years before the usual daytime hours turn into night, and by then I hope a single planet's rotation is a historical oddity.

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