One day far in the future when the planet is united, would it be appropriate to start a new calendar at the neutral date 7/16/1969? Or a Mars landing?

Yes. A human achievement - the Moon landing.
No. Multiple calendars are fine.
Yes a human achievement - Mars landing.
Something else
This is a solution in search of a problem
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One day far in the future when the planet is united, would it be appropriate to start a new calendar at the neutral date 7/16/1969? Or a Mars landing?
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