import { CellValue } from "../types/cells";
import { Format } from "../types/format";
import { Locale } from "../types/locale";
/**
 * All Spreadsheet dates are internally stored as an object with two values:
 * - value (number), which represent the number of day till 30/12/1899
 * - format (string), which keep the information on how the date was defined
 */
export interface InternalDate {
    readonly value: number;
    readonly format: Format;
    readonly jsDate?: ReadonlyDateTime;
}
/**
 * A DateTime object that can be used to manipulate spreadsheet dates.
 * Conceptually, a spreadsheet date is simply a number with a date format,
 * and it is timezone-agnostic.
 * This DateTime object consistently uses UTC time to represent a naive date and time.
 */
export declare class DateTime {
    private jsDate;
    constructor(year: number, month: number, day: number, hours?: number, minutes?: number, seconds?: number);
    static fromTimestamp(timestamp: number): DateTime;
    static now(): DateTime;
    toString(): string;
    toLocaleDateString(): string;
    getTime(): number;
    getFullYear(): number;
    getMonth(): number;
    getQuarter(): number;
    getDate(): number;
    getDay(): number;
    getHours(): number;
    getMinutes(): number;
    getSeconds(): number;
    getIsoWeek(): number;
    setFullYear(year: number): number;
    setMonth(month: number): number;
    setDate(date: number): number;
    setHours(hours: number): number;
    setMinutes(minutes: number): number;
    setSeconds(seconds: number): number;
}
type ReadonlyDateTime = Readonly<Omit<DateTime, "setSeconds" | "setMinutes" | "setHours" | "setDate" | "setMonth" | "setFullYear">>;
export declare const INITIAL_1900_DAY: DateTime;
export declare const MS_PER_DAY: number;
export declare const mdyDateRegexp: RegExp;
export declare const ymdDateRegexp: RegExp;
export declare const timeRegexp: RegExp;
/** Convert a value number representing a date, or return undefined if it isn't possible */
export declare function valueToDateNumber(value: CellValue, locale: Locale): number | undefined;
export declare function isDateTime(str: string, locale: Locale): boolean;
export declare function parseDateTime(str: string, locale: Locale): InternalDate | null;
export declare function numberToJsDate(value: number): DateTime;
export declare function jsDateToRoundNumber(date: DateTime): number;
export declare function jsDateToNumber(date: DateTime): number;
/** Return the number of days in the current month of the given date */
export declare function getDaysInMonth(date: DateTime): number;
export declare function isLastDayOfMonth(date: DateTime): boolean;
/**
 * Add a certain number of months to a date. This will adapt the month number, and possibly adapt
 * the day of the month to keep it in the month.
 *
 * For example "31/12/2020" minus one month will be "30/11/2020", and not "31/11/2020"
 *
 * @param keepEndOfMonth if true, if the given date was the last day of a month, the returned date will
 *          also always be the last day of a month.
 */
export declare function addMonthsToDate(date: DateTime, months: number, keepEndOfMonth: boolean): DateTime;
export declare function getYearFrac(startDate: number, endDate: number, _dayCountConvention: number): number;
/**
 * Get the number of whole months between two dates.
 * e.g.
 *  2002/01/01 -> 2002/02/01 = 1 month,
 *  2002/01/01 -> 2003/02/01 = 13 months
 * @param startDate
 * @param endDate
 * @returns
 */
export declare function getTimeDifferenceInWholeMonths(startDate: DateTime, endDate: DateTime): number;
export declare function getTimeDifferenceInWholeDays(startDate: DateTime, endDate: DateTime): number;
export declare function getTimeDifferenceInWholeYears(startDate: DateTime, endDate: DateTime): number;
export declare function areTwoDatesWithinOneYear(startDate: number, endDate: number): boolean;
export declare function areDatesSameDay(startDate: number, endDate: number): boolean;
export declare function isDateBetween(date: number, startDate: number, endDate: number): boolean;
/** Check if the first date is strictly before the second date */
export declare function isDateStrictlyBefore(date: number, dateBefore: number): boolean;
/** Check if the first date is before or equal to the second date */
export declare function isDateBefore(date: number, dateBefore: number): boolean;
/** Check if the first date is strictly after the second date */
export declare function isDateStrictlyAfter(date: number, dateAfter: number): boolean;
/** Check if the first date is after or equal to the second date */
export declare function isDateAfter(date: number, dateAfter: number): boolean;
export {};