export declare class DateUtil {
    static TimeInOneMinute: number;
    static TimeInOneHour: number;
    static TimeInOneDay: number;
    static beginningOfDate(date: Date): Date;
    static endOfDate(date: Date): Date;
    static firstWeekDayOfDate(date: Date): Date;
    static firstDayOfLastNMonth(date: Date, n: number): Date;
    static firstYearDayOfDate(date: Date): Date;
    static lastWeekDayOfDate(date: Date): Date;
    static firstMonthDayOfDate(date: Date): Date;
    static dayAgoOfDate(date: Date, ago: number): Date;
    static dayAfterOfDate(date: Date, after: number): Date;
    static format(date: Date, format?: string): string;
}