import { FishDate } from './fish-date';
export declare type FishPeriod = 'y' | 'm' | 'd';
export declare abstract class FishCalendar {
    abstract getDaysPerWeek(): number;
    abstract getMonths(): number[];
    abstract getWeeksPerMonth(): number;
    abstract getWeekday(date: FishDate): number;
    abstract getNext(date: FishDate, period?: FishPeriod, number?: number): FishDate;
    abstract getPrev(date: FishDate, period?: FishPeriod, number?: number): FishDate;
    abstract getWeekNumber(week: FishDate[], firstDayOfWeek: number): number;
    abstract getToday(): FishDate;
    abstract isValid(date: FishDate): boolean;
}
export declare class FishCalendarGregorian extends FishCalendar {
    getDaysPerWeek(): number;
    getMonths(): number[];
    getWeeksPerMonth(): number;
    getNext(date: FishDate, period?: FishPeriod, number?: number): FishDate;
    getPrev(date: FishDate, period?: FishPeriod, number?: number): FishDate;
    getWeekday(date: FishDate): number;
    getWeekNumber(week: FishDate[], firstDayOfWeek: number): number;
    getToday(): FishDate;
    isValid(date: FishDate): boolean;
}