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JavaScript's date object has been tricky for years, but that is changing. The NEW Temporal API brings, 🌍 Easily handle time zones 📆 Precise date math 🕒 Parse ISO strings without errors ⌛ Durations, date ranges, and more. Start experimenting 👇 developer.mozilla.org/en-US/docs/...

Temporal inherits 3+ design flaws from CLDR: - (ISO) Weeks should have their own calendar system. - Gregorian lunar months (from its Easter Computus) should be available as their own calendar system. - There should be (at least) one optional level between year and month, e.g. season.

Put differently, within a calendar system, each grouping of dates should be a true superset of all smaller/descendant groupings, i.e. either each month consists of a whole number of full weeks or they are part of different systems used in parallel.

Also, the start (and therefore end) of a date should be able to differ from midnight. It should be simple for authors to declare additional (special-purpose,custom, novel or rare) calendar systems. 10^8 days is wide enough a span for all of recorded human history, but not enough for astronomy.

Hi! Thanks for the suggestions. A calendar-like abstraction for times of day was considered (called a "time scale" or "time calendar"), but it was not included due to limited use cases. It could still be added later.

A pluggable calendar API was part of an earlier version of the proposal, but it was dropped due to complexity and limited use cases. You can read more about the reasoning and options in github.com/tc39/proposa....