It turns out there's no comprehensive standard for date arithmetic.

This page summarizes the projects mentioned and recommended in the original post on /r/ISO8601

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  • proposal-temporal

    Provides standard objects and functions for working with dates and times.

    • This exact issue was pointed out on some public comment, but this seemingly went nowhere. There's also discussion around its lack of algorithm for negative duration.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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