everyutil/date/isSameISOWeek.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.isSameISOWeek = void 0;
/**
 * Checks if two dates belong to the same ISO week number.
 * @author @dailker
 * @param {Date} a
 * @param {Date} b
 * @returns {boolean}
 */
function isSameISOWeek(a, b) {
    const getWeek = (d) => {
        const date = new Date(Date.UTC(d.getFullYear(), d.getMonth(), d.getDate()));
        const dayNum = date.getUTCDay() || 7;
        date.setUTCDate(date.getUTCDate() + 4 - dayNum);
        const yearStart = new Date(Date.UTC(date.getUTCFullYear(), 0, 1));
        return Math.ceil((((date.getTime() - yearStart.getTime()) / 86400000) + 1) / 7);
    };
    return a.getUTCFullYear() === b.getUTCFullYear() && getWeek(a) === getWeek(b);
}
exports.isSameISOWeek = isSameISOWeek;