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MDN Web Docs
@developer.mozilla.org

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/...

developer.mozilla.orgTemporal - JavaScript | MDNThe Temporal object enables date and time management in various scenarios, including built-in time zone and calendar representation, wall-clock time conversions, arithmetics, formatting, and more. It is designed as a full replacement for the Date object.
Christoph Päper
@crissov.de

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.

Christoph Päper
@crissov.de

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.

Christoph Päper
@crissov.de

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.

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Shane Carr
@sffc.bsky.social

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.

Christoph Päper
@crissov.de

Thank you very much for your replies and pointers. Years ago, I read an early draft of Temporal. So I guess my vague memories of support for custom calendars were not imaginations on my part after all. I just did not realize this had been removed in the process until now.