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

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

import { Temporal } from "@js-temporal/polyfill";
import { isValidTime } from "../validate/index.js";
/**
 * Return the earliest (minimum) of the given PlainTime values.
 *
 * - Returns null if the array is empty or contains no valid times.
 * - Validation is performed on each item in the array.
 *
 * @param times Array of ISO PlainTime strings (e.g. "14:30:00")
 * @returns The earliest time string, or null on invalid input
 *
 * @example minTime(["14:30:00", "09:00:00", "20:45:00"]) // "09:00:00"
 * @example minTime([]) // null
 */
export function minTime(times) {
    if (!times.length)
        return null;
    const valid = times.filter(isValidTime);
    if (!valid.length)
        return null;
    try {
        const min = valid.reduce((currentMin, candidateStr) => {
            const candidate = Temporal.PlainTime.from(candidateStr);
            return Temporal.PlainTime.compare(candidate, currentMin) < 0
                ? candidate
                : currentMin;
        }, Temporal.PlainTime.from(valid[0]));
        return min.toString();
    }
    catch {
        return null;
    }
}