export declare class DateHelper {
    static padZero(num: number): string;
    static formatDate(date: Date): string;
    static parseDate(dateStr: string): Date;
    static getToday(): string;
    static isSameDay(a: string | Date, b: string | Date): boolean;
    static isBefore(a: Date, b: Date): boolean;
    static isAfter(a: Date, b: Date): boolean;
    static startOfMonth(date: Date): Date;
    static addMonths(date: Date, diff: number): Date;
    static addDays(date: Date, diff: number): Date;
    static getCalendarDates(monthDate: Date, startOfWeek: 'sunday' | 'monday'): Date[];
    static endOfMonth(date: Date): Date;
    static getCalendarDatesForCalendar(monthDate: Date, startOfWeek: 'sunday' | 'monday'): Date[];
    static getDatesInRange(startDate: Date, endDate: Date): Date[];
}