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1import { Duration } from '../duration/constructor';
2import { UnitOfTime } from '../types';
3export declare function add(date: Date, val: number, period: UnitOfTime, isUTC?: boolean): Date;
4export declare function subtract(date: Date, val: number, period: UnitOfTime, isUTC?: boolean): Date;
5export declare function addSubtract(date: Date, duration: Duration, isAdding: number, isUTC?: boolean): Date;