import { BigNumber } from 'ethers';
import { BigNumberish } from './numbers';
export declare const SECOND = 1;
export declare const MINUTE: number;
export declare const HOUR: number;
export declare const DAY: number;
export declare const WEEK: number;
export declare const MONTH: number;
export declare const YEAR: number;
export declare const currentTimestamp: () => Promise<BigNumber>;
export declare const advanceTime: (seconds: BigNumberish) => Promise<void>;
export declare const setNextBlockTimestamp: (timestamp: BigNumberish) => Promise<void>;