export declare class DateUtil {
    static parseDuration(duration: string | number): number;
    static addDuration(date: Date, duration: string | number): Date;
    static isPast(date: Date): boolean;
    static isFuture(date: Date): boolean;
    static getTimeUntil(date: Date): {
        milliseconds: number;
        seconds: number;
        minutes: number;
        hours: number;
        days: number;
        formatted: string;
    };
    static format(date: Date, format?: 'short' | 'long' | 'iso'): string;
    static getRelativeTime(date: Date): string;
}
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