import { CalendarDate, DateDiffOptions } from './calendar';
import { TimePeriod, TimePeriodFieldFlag } from './interval';
import { YearMonthDay } from './math';
/**
 * State maintained for the difference calculation.
 *
 * Public for testing.
 */
export declare class DifferenceState {
    readonly date1: CalendarDate;
    readonly date2: CalendarDate;
    readonly options: DateDiffOptions;
    one: YearMonthDay;
    two: YearMonthDay;
    readonly epoch2: number;
    ms1: number;
    ms2: number;
    zoneId: string;
    readonly sign: number;
    readonly incr: number;
    readonly fractions: boolean;
    readonly flags: number;
    readonly smallestFlag: number;
    readonly monthCount: number;
    constructor(date1: CalendarDate, date2: CalendarDate, options: DateDiffOptions);
    /**
     * Return true if the flag is set.
     */
    has(flag: TimePeriodFieldFlag): boolean;
    /**
     * Return true if a flag is the smallest field in the set.
     */
    smallest(flag: TimePeriodFieldFlag): boolean;
}
/**
 * Calculate the difference between two dates in years, months, days, etc.
 *
 * Specification of algorithm:
 * https://tc39.es/proposal-temporal/#sec-temporal-differencezoneddatetime
 *
 * Compatible with the Temporal API until and since methods:
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal/ZonedDateTime/since
 * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal/ZonedDateTime/until
 */
export declare const difference: (date1: CalendarDate, date2: CalendarDate, options: DateDiffOptions) => TimePeriod;
/**
 * WARNING: This is only designed to be used for small day increments, mainly
 * to support 1- or 2-day adjustments. We use Julian day in other calculations
 * which lets us directly add or subtract any number of days.
 *
 * Adjust the day parameter to correct for underflow and overflow of the
 * given year and month.
 *
 * For example: adding 3 days to "2024-01-30" returns "2024-02-02" and
 * subtracting 3 days from "2024-02-02" returns "2024-01-30".
 */
export declare const adjustDays: (year: number, month: number, day: number) => {
    year: number;
    month: number;
    day: number;
};