export declare const getCalendarDays: (date: Date) => (number | null)[];
export declare const getNextDay: (date: Date) => Date;
export declare const getPreviousDay: (date: Date) => Date;
export declare const getNextWeek: (date: Date) => Date;
export declare const getPreviousWeek: (date: Date) => Date;
export declare const getDateString: (date: Date | undefined) => string;