/**
 * Retrieves the number of days in a given BS year and month.
 * @param year BS year (2000 - 2089)
 * @param month BS month (1 - 12)
 */
export declare function getDaysInBSMonth(year: number, month: number): number;
/**
 * Checks if a given BS date is valid.
 * @param year BS year
 * @param month BS month (1-12)
 * @param day BS day
 */
export declare function isValidBSDate(year: number, month: number, day: number): boolean;
/**
 * Converts a Bikram Sambat (BS) date to a Gregorian (AD) Date object.
 * The returned Date object represents the start of the day (00:00:00) in the Nepal timezone (Asia/Kathmandu).
 */
export declare function bsToAd(year: number, month: number, day: number): Date;
export declare function bsToAd(dateStr: string): Date;
export declare function bsToAd(dateObj: {
    year: number;
    month: number;
    day: number;
}): Date;
/**
 * Converts a Gregorian (AD) date to a Bikram Sambat (BS) date object.
 * It uses the calendar date (Year, Month, Day) in the Nepal timezone (Asia/Kathmandu).
 */
export declare function adToBs(date: Date): {
    year: number;
    month: number;
    day: number;
    isHoliday: boolean;
    holidayName: string | null;
};
export declare function adToBs(dateStr: string): {
    year: number;
    month: number;
    day: number;
    isHoliday: boolean;
    holidayName: string | null;
};
export declare function adToBs(timestamp: number): {
    year: number;
    month: number;
    day: number;
    isHoliday: boolean;
    holidayName: string | null;
};