@technobuddha/library/dist/get-day-of-week.js

A large library of useful functions

import { day, daysPerWeek } from "./constants.js";
import { modulo } from "./modulo.js";
/**
 * Determine the day of the week for a specific date
 *
 * @param input - The date
 * @param options - see {@link DayOfWeekOptions}
 * @defaultValue utc false
 * @returns The date value for midnight on the first day of the specified year
 * @group Time
 * @category Week
 */
export function getDayOfWeek(input, { utc = false, startOfWeek = day.sunday } = {}) {
    if (utc) {
        return modulo(input.getUTCDay() + daysPerWeek - startOfWeek, daysPerWeek);
    }
    return modulo(input.getDay() + daysPerWeek - startOfWeek, daysPerWeek);
}
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