import { Calendar } from './calendar';
import { JulianDate } from "./julian-date";
import { GregorianDate } from "./gregorian-date";
export declare abstract class HistoricalDate {
    readonly calendar: Calendar;
    constructor(calendar: Calendar);
    abstract year: number | undefined;
    abstract month: number | undefined;
    abstract day: number | undefined;
    abstract readonly isLeapYear: boolean;
    abstract toGregorian(): GregorianDate;
    abstract toJulian(): JulianDate;
    /**
     * Returns a new date which is moved by the specified number of days.
     */
    abstract addDays(days: number): HistoricalDate;
    toDate(): Date;
    /**
     * Checks whether this is the same date as another date.
     */
    equals(other: HistoricalDate): boolean;
}