import moment from 'moment';
export declare class DateTime {
    static getDateDifferenceString(startDate?: Date, endDate?: Date): string;
    static minusDateByDays(input: Date, dayNumber: number): Date;
    static getDateTimeFriendlyString(startDateTimeString: string, endDateTimeString: string): string;
    static getMoment(input: string | number): moment.Moment;
}