@technobuddha/library/getDayOfWeek/getDayOfWeek.mjs

A large library of useful functions

import { day, daysPerWeek } from '../constants';
import modulo from '../modulo';
/**
 * Determine the day of the week for a specific date
 *
 * @param input The date
 * @param __namedParameters see {@link Options}
 * @default UTC false
 * @default startOfWeek Monday
 * @returns The date value for midnight on the first day of the specified year
 */
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);
}
export default getDayOfWeek;