import * as dateFns from 'date-fns';
export declare function DateFns(): typeof dateFns;
export declare const DateHelper: {
    intervalToFormattedTime(start: Date, end: Date, showSymbol?: boolean): {
        hours: number;
        minutes: number | undefined;
        seconds: number | undefined;
        negative: boolean;
        formatted: string;
    };
    format(date: string | Date | undefined, format?: string): string;
    parse(date: string, format: string): Date;
    minutesToFormattedTime(minutes: number): string;
    formattedTimeToMinutes(text: string): number;
};