@burglekitt/gmt/dist/zoned/calculate/maxZoned.js

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

import { Temporal } from "@js-temporal/polyfill";
import { isValidZonedDateTime } from "../validate/index.js";
/**
 * Return the latest (maximum) of the given ZonedDateTime values.
 *
 * - Returns null if the array is empty or contains no valid dates.
 * - Validation is performed on each item in the array.
 *
 * @param zonedDateTimes Array of ISO ZonedDateTime strings
 * @returns The latest zoned datetime string, or null on invalid input
 *
 * @example maxZoned(["2024-03-10T12:00:00[America/New_York]", "2024-03-15T12:00:00[America/New_York]"]) // "2024-03-15T12:00:00-04:00[America/New_York]"
 * @example maxZoned(["invalid", "2024-03-15T12:00:00[America/New_York]"]) // "2024-03-15T12:00:00-04:00[America/New_York]"
 * @example maxZoned(["invalid", "also invalid"]) // null
 * @example maxZoned([]) // null
 */
export function maxZoned(zonedDateTimes) {
    if (!zonedDateTimes.length)
        return null;
    const valid = zonedDateTimes.filter(isValidZonedDateTime);
    if (!valid.length)
        return null;
    try {
        const max = valid.reduce((currentMax, candidateStr) => {
            const candidate = Temporal.ZonedDateTime.from(candidateStr);
            return Temporal.ZonedDateTime.compare(candidate, currentMax) > 0
                ? candidate
                : currentMax;
        }, Temporal.ZonedDateTime.from(valid[0]));
        return max.toString();
    }
    catch {
        return null;
    }
}