import { DurationUnit } from "../common-types";
export declare class DateUtils {
    static isHoliday(date: Date): boolean;
    static isBusinessDay(date: Date): boolean;
    static add(date: Date, amount?: number, unit?: DurationUnit): Date;
    static businessAdd(date: Date, amount?: number, unit?: DurationUnit, freeDays?: Date[]): Date;
    static businessSubtract(date: Date, amount?: number, unit?: DurationUnit): Date;
}