import { LocaleData, TimeUnit } from '../types/index';
import { Duration } from './Duration';
export declare class DateUtils {
    private date;
    private currentLocale;
    private timezone;
    constructor(date?: Date | string | number, formatOrLocale?: string | LocaleData, locale?: LocaleData);
    locale(localeObject: LocaleData): this;
    tz(timezone: string): this;
    add(value: number, unit: TimeUnit): this;
    subtract(value: number, unit: TimeUnit): this;
    startOf(unit: TimeUnit): this;
    endOf(unit: TimeUnit): this;
    isBefore(otherDate: Date | string | number | DateUtils): boolean;
    isAfter(otherDate: Date | string | number | DateUtils): boolean;
    isSameDay(otherDate: Date | string | number | DateUtils): boolean;
    isSameMonth(otherDate: Date | string | number | DateUtils): boolean;
    diff(otherDate: Date | string | number | DateUtils): Duration;
    toDate(): Date;
    dayOfYear(): number;
    weekOfYear(): number;
    quarter(): number;
    calendar(): DateUtils[][];
    format(formatString: string): string;
}