@burglekitt/gmt/dist/plain/map/mapDaysInMonth.js

Temporal-based date and time utilities with timezone support and polyfill integration

import { Temporal } from "@js-temporal/polyfill";
/**
 * Return an array of ISO PlainDate strings for every day in the given year-month.
 *
 * - Generates array of dates for the specified month.
 * - Validates input matches the year-month format exactly.
 * - Returns [] for invalid input.
 *
 * @param month ISO PlainYearMonth string (YYYY-MM)
 * @returns array of ISO PlainDate strings for each day in the month
 *
 * @example mapDaysInMonth("2024-02") // ["2024-02-01", "2024-02-02", ..., "2024-02-29"]
 * @example mapDaysInMonth("2024-04") // ["2024-04-01", "2024-04-02", ..., "2024-04-30"]
 * @example mapDaysInMonth("invalid") // []
 */
export function mapDaysInMonth(month) {
    try {
        const yearMonth = Temporal.PlainYearMonth.from(month);
        if (yearMonth.toString() !== month) {
            return [];
        }
        const daysInMonth = yearMonth.daysInMonth;
        return Array.from({ length: daysInMonth }, (_, index) => {
            const day = (index + 1).toString().padStart(2, "0");
            return `${yearMonth.toString()}-${day}`;
        });
    }
    catch {
        return [];
    }
}