// A LocalDate from Core ("2026-09-27"), by default as a short day; noon, so no time zone moves it to the day before.
export const formatDay = (day, locale, options = {day: 'numeric', month: 'short'}) =>
    new Date(`${day}T12:00:00`).toLocaleDateString(locale, options);

// An instant from the backend (ISO string or epoch millis) as a date, or as date and time.
export const formatDate = (instant, locale, options) => new Date(instant).toLocaleDateString(locale, options);

export const formatDateTime = (instant, locale, options) => new Date(instant).toLocaleString(locale, options);