everyutil/date/dateNthWeekdayOfMonth.js

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.dateNthWeekdayOfMonth = void 0;
/**
 * Finds the Nth occurrence of a specific weekday in a month.
 * @author @dailker
 * @param {number} year
 * @param {number} month - 0=Jan, 11=Dec
 * @param {number} weekday - 0=Sun, 6=Sat
 * @param {number} n - Nth occurrence
 * @returns {Date|null}
 */
function dateNthWeekdayOfMonth(year, month, weekday, n) {
    let count = 0;
    for (let day = 1; day <= 31; day++) {
        const d = new Date(year, month, day);
        if (d.getMonth() !== month)
            break;
        if (d.getDay() === weekday) {
            count++;
            if (count === n)
                return d;
        }
    }
    return null;
}
exports.dateNthWeekdayOfMonth = dateNthWeekdayOfMonth;