vremel/dist/datetime/_getDayOfWeekFromYmd.js

JavaScript date utility library for Temporal API

import { formatDateIso } from "./_formatDateIso.js";
/**
 * @internal
 * same as temporal's spec, Monday: 1, Tuesday: 2, ... Sunday: 7
 */
export function getDayOfWeekFromYmd(year, month, day) {
    const date = new Date(Date.UTC(year, month - 1, day));
    if (date.getUTCFullYear() !== year ||
        date.getUTCMonth() !== month - 1 ||
        date.getUTCDate() !== day) {
        throw new Error(`Invalid date: ${formatDateIso(year, month, day)}`);
    }
    return ((date.getUTCDay() + 6) % 7) + 1;
}
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