Get time interval with formatDateInterval about cldr-engine HOT 2 OPEN

Hi @gmarty the behavior currently mimics the matching process described here in the standard. It attempts to find the "field of greatest difference" between the two dates, and combines that with the skeleton to select the most appropriate interval format. As a result, if two dates differ in the year, month or day, it will try to select an interval format to include those date fields.

A possible hack: if you know you only ever want to display intervals with hour and minute fields visible, you can copy the date fields to the end date, ensuring the field of greatest difference is one of the time fields:

const start = cldr.Calendars.toGregorianDate(new Date(2023, 0, 1, 12, 34, 56));
let end = cldr.Calendars.toGregorianDate(new Date(2023, 11, 31, 15, 37, 44));

// modify end date to fall on the same (year, month, day)
const { year, month, day } = start.fields();
end = end.set({ year, month, day });

s = cldr.Calendars.formatDateInterval(start, end, { skeleton: "Hmm" });
console.log(s);

//> en:   17:34 – 20:37
//> ja:   17時34分～20時37分

from cldr-engine.

I ended up using the hack you suggested and it works. Maybe you could add a little comment in the docs about it.

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