declare let now: Date;
declare type EachSecondHook = (lastNow: Date) => void;
declare const useKeepNowUpToDate: () => void;
declare const registerEachSecondHook: (eachSecondHook: EachSecondHook) => void;
declare const unregisterEachSecondHook: (eachSecondHook: EachSecondHook) => void;

export { now, registerEachSecondHook, unregisterEachSecondHook, useKeepNowUpToDate };