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Viewing file:     index.js (1.14 KB)      -rw-r--r--

import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
 * @name differenceInCalendarYears
 * @category Year Helpers
 * @summary Get the number of calendar years between the given dates.
 *
 * @description
 * Get the number of calendar 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 calendar years
 * @throws {TypeError} 2 arguments required
 *
 * @example
 * // How many calendar years are between 31 December 2013 and 11 February 2015?
 * const result = differenceInCalendarYears(
 *   new Date(2015, 1, 11),
 *   new Date(2013, 11, 31)
 * )
 * //=> 2
 */

export default function differenceInCalendarYears(dirtyDateLeft, dirtyDateRight) {
  requiredArgs(2, arguments);
  var dateLeft = toDate(dirtyDateLeft);
  var dateRight = toDate(dirtyDateRight);
  return dateLeft.getFullYear() - dateRight.getFullYear();
}