cal.pub0.org/packages/lib/weekday.ts

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type WeekdayFormat = "short" | "long";
// By default starts on Sunday (Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday)
export function weekdayNames(locale: string | string[], weekStart = 0, format: WeekdayFormat = "long") {
return Array(7)
.fill(null)
.map((_, day) => nameOfDay(locale, day + weekStart, format));
}
export function nameOfDay(
locale: string | string[] | undefined,
day: number,
format: WeekdayFormat = "long"
) {
return new Intl.DateTimeFormat(locale, { weekday: format }).format(new Date(1970, 0, day + 4));
}