/** Useful for recurring dates like birthday */
export type YearDate = {
    day: number | null;
    month: number | null;
};
export declare namespace YearDate {
    function isValid(yd: YearDate): yd is YearDate;
    function matches(yearDate: YearDate, date: Date | number, local?: boolean): boolean;
    function toDate(yd: YearDate, year?: number): Date | null;
    function fromDate(date: Date | number): YearDate;
    function equals(yd1: YearDate, yd2: YearDate): boolean;
}