export declare function isSameDate(date1: Date, date2: Date): boolean;
export declare function isDateBefore(date1: Date, date2: Date): boolean;
export declare function isDateAfter(date1: Date, date2: Date): boolean;
export declare function isDateBetween(date: Date, start: Date, end: Date): boolean;
export declare function normalizeDate(date: Date): Date;
export declare function isValidDate(date: any): date is Date;