export declare function isoStringsToDate(date: string, time?: string): Date;
export declare function isValidaTimeString(v?: string): boolean;
export declare function isValidDateString(v?: string): boolean;
export declare function dateToIso(d: Date): string;
export declare function localDateToIso(d: Date): string;
export declare function getWeekStartDate(d: Date, day: number): Date;
export declare function getWeekID(d: Date): number;