export declare function daysAfter(date: Date, days: number): Date;
export declare function addMonths(date: Date, m: number): Date;
export declare function addDays(date: Date, days: number): Date;
export declare function isSameDay(date1: Date, date2: Date): boolean;
export declare function isToday(date: Date): boolean;
export declare function isYesterday(date: Date): boolean;
export declare function diffDays(firstDate: Date, secondDate: Date): number;
export declare function formatDate(date: Date, format?: string): string;
export declare function fromNowString(date: Date, format?: string): string;