Date formatting config for only months or years?

[bdarcus]

EDIT: I spent some time reading the datetime options length source code, and unless I'm missing something, this isn't possible?

I can do this, but can't independently adjust or turn off years, or days, for a date?

---

I'm working on a project where I need localization, and this seems perfect. But I'm confused on how to implement it.

My prototype was in typescript, where I have this function:

  formatDate(date: string, options: Intl.DateTimeFormatOptions): string {
    const parsedDate = edtf.default(date);
    const optKeys = Object.keys(options); // read the options from the input style
    const formattedDate = edtf.format(parsedDate, "en-US", options);
    return formattedDate;
  }

The input JSON for the two projects will actually be the same, and has two pieces.

First, there's an options section, which in YAML looks like this:

options:
  dates:
    date: long
    month: long
    time: long
    year: numeric

... and then there are templates, which look like this:

      - date: issued
        format: year

So I need to be able to map those "format" strings, whose values are "year", "month_day" and such, to the icu datetime config.

To bottom line it, then, how do I configure, say, only month formatting for a date, or only year?

PS - in the typescript, I have this function to configure it; I'm looking for something equivalent.

  dateFormatConfig(format: string): Intl.DateTimeFormatOptions {
    const monthConfig = this.style.options?.dates?.month || "long";
    const dateFormats = {
      year: { year: "numeric", month: undefined, day: undefined },
      "year-month": {
        year: "numeric",
        month: `${monthConfig}`,
        day: undefined,
      },
      "month-day": { year: undefined, month: `${monthConfig}`, day: "numeric" },
      full: { year: "numeric", month: `${monthConfig}`, day: "numeric" },
    };

    return dateFormats[format];
  }