"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = subYears;

var _index = _interopRequireDefault(require("../_lib/toInteger/index.js"));

var _index2 = _interopRequireDefault(require("../addYears/index.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * @name subYears
 * @category Year Helpers
 * @summary Subtract the specified number of years from the given date.
 *
 * @description
 * Subtract the specified number of years from the given date.
 *
 * ### v2.0.0 breaking changes:
 *
 * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
 *
 * @param {Date|Number} date - the date to be changed
 * @param {Number} amount - the amount of years to be subtracted
 * @returns {Date} the new date with the years subtracted
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // Subtract 5 years from 1 September 2014:
 * var result = subYears(new Date(2014, 8, 1), 5)
 * //=> Tue Sep 01 2009 00:00:00
 */
function subYears(dirtyDate, dirtyAmount) {
  if (arguments.length < 2) {
    throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
  }

  var amount = (0, _index.default)(dirtyAmount);
  return (0, _index2.default)(dirtyDate, -amount);
}

module.exports = exports.default;