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-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;
-} \ No newline at end of file
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