import type { HoursTypeInt } from "../types/clock/hoursTypeInt";
import type { DayTypeInt } from "../types/date/dayTypeInt";
import type { MonTypeInt } from "../types/date/monTypeInt";
/**
 * Calculate age based on birthdate
 * @param  {number} year - Birth year
 * @param  {number} mon - Birth month (1-12)
 * @param  {number} day - Birth day
 * @param  {number} [timeDifference=9] - Time difference from UTC in hours
 * @returns {number} Age in years
 * @example birthday(2000, 1, 1); // Returns age of someone born on Jan 1, 2000
 */
export declare const birthday: <T extends MonTypeInt>(year: number, mon: T, day: DayTypeInt<T>, timeDifference?: HoursTypeInt) => number;