export declare const convertToServerDateFormat: ({ year, month, day, }?: {
    year?: number | string;
    month?: number | string;
    day?: number | string;
}) => string | null;
export declare const convertFromServerDateFormat: (serverDate?: string) => {
    day?: undefined;
    month?: undefined;
    year?: undefined;
} | {
    day: string;
    month: string;
    year: string;
};