declare const Iso8601Brand: unique symbol;
declare const Iso8601DurationBrand: unique symbol;
export type Iso8601 = string & {
    readonly [Iso8601Brand]: true;
};
export type Iso8601Duration = string & {
    readonly [Iso8601DurationBrand]: true;
};
export declare function nowIso(): Iso8601;
export declare function toIso(d: Date): Iso8601;
export declare function fromIso(s: string): Date;
export declare function isIso8601(s: string): s is Iso8601;
export interface Duration {
    readonly years: number;
    readonly months: number;
    readonly weeks: number;
    readonly days: number;
    readonly hours: number;
    readonly minutes: number;
    readonly seconds: number;
}
export declare function parseDuration(s: string): Duration;
export declare function addDuration(at: Iso8601 | Date | string, d: string | Duration): Iso8601;
export declare function durationToMs(d: Duration): number;
export {};
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