export declare const getNationalHolidays: (year: number) => Date[];
export declare const isNationalHoliday: (givenDate: Date) => boolean;
export declare const isWorkingDay: (date: Date) => boolean;
export declare const getNextWorkingDay: (date?: Date) => Date;
export declare const getFirstDayMouth: () => number;
export declare const getPrevWorkingDay: (date?: Date) => Date;