@burglekitt/gmt/dist/plain/calculate/getDaysInMonth.js

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

import { Temporal } from "@js-temporal/polyfill";
import { isValidDate } from "../validate/index.js";
/**
 * Return the number of days in the month containing `value`.
 *
 * - 28–31 depending on the month; February varies by leap year.
 * - Returns null on invalid input.
 *
 * @param value ISO PlainDate string
 * @returns number of days in the month (28-31), or null on invalid input
 *
 * @example getDaysInMonth("2024-02-15") // 29 (leap year)
 * @example getDaysInMonth("2023-02-15") // 28
 * @example getDaysInMonth("2024-04-01") // 30
 * @example getDaysInMonth("2024-01-01") // 31
 * @example getDaysInMonth("invalid") // null
 */
export function getDaysInMonth(value) {
    if (!isValidDate(value))
        return null;
    try {
        const date = Temporal.PlainDate.from(value);
        return date.daysInMonth;
    }
    catch {
        return null;
    }
}