import type { Brand } from 'ts-brand';
export type Iso8601 = Brand<string, 'Iso8601'>;
/**
 * Asserts that a value is a String which conforms to common use-cases of the ISO 8601 standard representation of dates
 * and times.
 *
 * - '1999-12-31'
 * - '1999-12-31T23:59'
 * - '1999-12-31T23:59:59'
 * - '1999-12-31T23:59:59.000'
 * - '1999-12-31T23:59:59.000Z'
 * - '1999-12-31T23:59:59+01:00'
 * - '1999-12-31T23:59:59-01:00'
 * - '1999-12-31T23:59:59.000+01:00'
 * - '1999-12-31T23:59:59.000-01:00'
 *
 * @tags guard, strings, dates
 */
export declare const isIso8601: (value: unknown) => value is Iso8601;