/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */

/**
 * @internal
 * Checks if a given date string is in ISO 8601 format.
 *
 * @param dateString - The date string to be checked.
 * @returns boolean - Returns true if the date string is in ISO 8601 format, otherwise false.
 */
export function isIso8601(dateString: number | string): boolean {
    if (typeof dateString !== "string") {
        return false;
    }

    const date = new Date(dateString);
    return !isNaN(date.getTime()) && date.toISOString() === dateString;
}