import { GregorianDate } from './gregorian';
import { TimePeriod } from './interval';
import { CalendarDateFields } from './types';
/**
 * Gregorian calendar with ISO-8601 first day of week and minimum days in week.
 *
 * type: iso8601
 *
 * @public
 */
export declare class ISO8601Date extends GregorianDate {
    protected constructor();
    add(fields: Partial<TimePeriod>): ISO8601Date;
    toString(): string;
    withZone(zoneId: string): ISO8601Date;
    static fromFields(fields: Partial<CalendarDateFields>, _firstDay: number, _minDays: number): ISO8601Date;
    static fromUnixEpoch(epoch: number, zoneId: string, _firstDay: number, _minDays: number): ISO8601Date;
    protected _new(): ISO8601Date;
    protected initFromUnixEpoch(epoch: number, zoneId: string): ISO8601Date;
}