export type DateStr = string;
export declare const formatDateStr: (date: Date) => DateStr;
export declare const currentDateStr: (now?: Date) => DateStr;
export declare const parseDateStr: (dateStr: DateStr) => Date;
export declare const addDays: (dateStr: DateStr, days: number) => DateStr;
export declare const compareDateStr: (a: DateStr, b: DateStr) => number;
export declare const isValidDateStr: (string: string) => boolean;