everyutil/date/parseISOWeekDate.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.parseISOWeekDate = void 0;
/**
 * Parses strings like 2025-W26-3 (year-week-day) into Date.
 * @author @dailker
 * @param {string} str
 * @returns {Date|null}
 */
function parseISOWeekDate(str) {
    const m = str.match(/(\d{4})-W(\d{2})-(\d)/);
    if (!m)
        return null;
    const [_, year, week, day] = m;
    const d = new Date(Date.UTC(+year, 0, 1 + (+week - 1) * 7));
    const dayNum = d.getUTCDay() || 7;
    d.setUTCDate(d.getUTCDate() + (+day - dayNum));
    return d;
}
exports.parseISOWeekDate = parseISOWeekDate;