/**
 * Formats a Date (UTC instant) as the calendar date in Asia/Kathmandu.
 * Uses Intl so it works on any OS/runtime without a tz database dependency.
 */
export declare function toKathmanduDateString(date: Date): string;
export declare function parseDateString(value: string): Date;
export declare function formatDateString(date: Date): string;
export declare function addDays(date: Date, days: number): Date;
export declare function dayOfWeekName(date: Date): string;