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Viewing file:     index.js (1.6 KB)      -rw-r--r--

import toDate from "../toDate/index.js";
import differenceInCalendarYears from "../differenceInCalendarYears/index.js";
import compareAsc from "../compareAsc/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
 * @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.
 *
 * @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
 */
export default function differenceInYears(dirtyDateLeft, dirtyDateRight) {
  requiredArgs(2, arguments);
  var dateLeft = toDate(dirtyDateLeft);
  var dateRight = toDate(dirtyDateRight);
  var sign = compareAsc(dateLeft, dateRight);
  var difference = Math.abs(differenceInCalendarYears(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 = compareAsc(dateLeft, dateRight) === -sign;
  var result = sign * (difference - Number(isLastYearNotFull));
  // Prevent negative zero
  return result === 0 ? 0 : result;
}