export type AddUTCKey = 'years' | 'year' | 'months' | 'month' | 'days' | 'day' | 'hours' | 'hour' | 'minutes' | 'minute' | 'seconds' | 'second' | 'milliseconds' | 'millisecond';
/**
 * Adds the provided amount of a specific key to the provided date
 *
 * @param {Date|string} val - Date to set to end of
 * @param {number} amount - (default=0) Amount of key to add
 * @param {AddUTCKey} key - (default='millisecond') Key to set
 */
declare function addUTC(val: Date | string, amt?: number, key?: AddUTCKey): Date;
export { addUTC, addUTC as default };