export declare const timeDuration: (startDate: number, endDate: number) => string;
declare const _default: {
    toUTC: (localDateTime: string, zone?: string) => Date;
    toLocalTime: (utcDateTime: string | Date, zone?: string) => Date;
    isISO8601: (value: string) => boolean;
    isDateFormat: (value: string) => boolean;
    isDateTimeFormat: (value: string) => boolean;
    timeDuration: (startDate: number, endDate: number) => string;
};
export default _default;