Why is the data-time story in Rust so weak?

[bdarcus]

This is just me venting, but this is the typescript code for EDTF parsing AND localized date-time formatting, and one or two of the lines are unnecessary.

  formatDate(date: string, options: Intl.DateTimeFormatOptions): string {
    const parsedDate = edtf.default(date);
    const year = parsedDate.year.toString();
    const optKeys = Object.keys(options);
    const useYear = optKeys.includes("year") && optKeys.length === 1;
    const formattedDate = useYear
      ? year
      : edtf.format(parsedDate, "en-US", options); // yeah, the locale is fixed here, but easy to generalize
    return formattedDate;
  }

Doing something equivalent in Rust with existing crates is basically impossible, and a huge hassle. Why?

I suppose ideally I'd fork edtf.rs and modify it so it's better suited for cases like this, which often don't have complete dates.