Variable ISO_WEEKDAY_NAMES`Const`

ISO_WEEKDAY_NAMES: Readonly<
    {
        "1": "Monday";
        "2": "Tuesday";
        "3": "Wednesday";
        "4": "Thursday";
        "5": "Friday";
        "6": "Saturday";
        "7": "Sunday";
    },
> = ...

Mapping of 1-indexed ISO weekday numbers (1..7, Monday=1, Sunday=7) to full English weekday names.