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Since Unix time does NOT count the leap seconds, it allows the computation of the human-readable time from the Unix time without knowing when the leap seconds occurred. If knowledge of when the leap seconds occurred is required, then those events would need to be available somehow and used, introducing i) more expensive computation ii) difficulty in future-proofing an app since a reliable and updated data source supplying the times of leap seconds is required.

The obvious solution would be to get rid of leap seconds entirely, and let UTC and solar time (when sun is highest at Greenwich) drift apart.

Sun rising 30 seconds later every century is not really a problem in my opinion.

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