declare global {
    interface Date {
        /**
         * Substract date
         * @param input Input date
         */
        substract(input: Date): TimeSpan;
    }
}
/**
 * TimeSpan
 */
export interface TimeSpan {
    totalMiniseconds: number;
    totalSeconds: number;
    totalMinutes: number;
    totalHours: number;
    totalDays: number;
    totalMonths: number;
    totalYears: number;
}
type DateType = Date | string | null | undefined;
type DateReturn<T extends DateType, R> = T extends Date ? R : R | undefined;
export declare namespace DateUtils {
    /**
     * Day format, YYYY-MM-DD
     */
    const DayFormat: Intl.DateTimeFormatOptions;
    /**
     * Minute format, YYYY-MM-DD hh:mm
     */
    const MinuteFormat: Intl.DateTimeFormatOptions;
    /**
     * Second format, YYYY-MM-DD hh:mm:ss
     */
    const SecondFormat: Intl.DateTimeFormatOptions;
    /**
     * Date format options
     */
    type FormatOptions = Intl.DateTimeFormatOptions | "d" | "dm" | "ds";
    /**
     * Format
     * @param input Input date time
     * @param locale Locale
     * @param options Options
     * @param timeZone Time zone
     */
    function format<T extends DateType>(input: T, locale?: string | string[], options?: FormatOptions, timeZone?: string): DateReturn<T, string>;
    /**
     * Format to 'yyyy-MM-dd' or 'yyyy-MM-ddThh:mm:ss, especially used for date input min/max property
     * @param date Input date
     * @param hasSecondOrType 'undefined' for date only, 'false' for hour:minute only, 'true' for all, or input field type
     */
    function formatForInput<T extends DateType>(date: T, hasSecondOrType?: boolean | string): DateReturn<T, string>;
    /**
     * Get month's days
     * @param year Year
     * @param month Month, starts from 0
     * @returns Days
     */
    const getDays: (year: number, month: number) => number;
    /**
     * Is the test date expired to now
     * @param testDate Test date
     * @returns Result
     */
    function isExpired(testDate?: Date | string | null): boolean;
    /**
     * Build JSON parser
     * @param keys Date field names
     * @returns JSON parser
     */
    const jsonParser: (keys: string[]) => (key: string, value: unknown) => unknown;
    /**
     * Parse string to date
     * 2021/10/31 or 2021-10-31
     * @param input Input string
     * @returns Date
     */
    function parse<T extends DateType>(input: T): DateReturn<T, Date>;
    /**
     * Two dates are in the same day
     * @param d1 First date
     * @param d2 Second date
     * @returns Result
     */
    function sameDay(d1?: Date | string | null, d2?: Date | string | null): boolean;
    /**
     * Two dates are in the same month
     * @param d1 First date
     * @param d2 Second date
     * @returns Result
     */
    function sameMonth(d1?: Date | string | null, d2?: Date | string | null): boolean;
}
export {};