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Viewing file:     index.js (2.13 KB)      -rw-r--r--

"use strict";

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

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

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

var _index3 = _interopRequireDefault(require("../compareAsc/index.js"));

var _index4 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));

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

/**
 * @name differenceInYears
 * @category Year Helpers
 * @summary Get the number of full years between the given dates.
 *
 * @description
 * Get the number of full years between the given dates.
 *
 * ### 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} dateLeft - the later date
 * @param {Date|Number} dateRight - the earlier date
 * @returns {Number} the number of full years
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // How many full years are between 31 December 2013 and 11 February 2015?
 * const result = differenceInYears(new Date(2015, 1, 11), new Date(2013, 11, 31))
 * //=> 1
 */
function differenceInYears(dirtyDateLeft, dirtyDateRight) {
  (0, _index4.default)(2, arguments);
  var dateLeft = (0, _index.default)(dirtyDateLeft);
  var dateRight = (0, _index.default)(dirtyDateRight);
  var sign = (0, _index3.default)(dateLeft, dateRight);
  var difference = Math.abs((0, _index2.default)(dateLeft, dateRight)); // Set both dates to a valid leap year for accurate comparison when dealing
  // with leap days

  dateLeft.setFullYear(1584);
  dateRight.setFullYear(1584); // Math.abs(diff in full years - diff in calendar years) === 1 if last calendar year is not full
  // If so, result must be decreased by 1 in absolute value

  var isLastYearNotFull = (0, _index3.default)(dateLeft, dateRight) === -sign;
  var result = sign * (difference - Number(isLastYearNotFull)); // Prevent negative zero

  return result === 0 ? 0 : result;
}

module.exports = exports.default;