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- var parse = require('../parse/index.js')
- /**
- * @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.
- *
- * @param {Date|String|Number} dateLeft - the later date
- * @param {Date|String|Number} dateRight - the earlier date
- * @returns {Number} the number of calendar years
- *
- * @example
- * // How many calendar years are between 31 December 2013 and 11 February 2015?
- * var result = differenceInCalendarYears(
- * new Date(2015, 1, 11),
- * new Date(2013, 11, 31)
- * )
- * //=> 2
- */
- function differenceInCalendarYears (dirtyDateLeft, dirtyDateRight) {
- var dateLeft = parse(dirtyDateLeft)
- var dateRight = parse(dirtyDateRight)
- return dateLeft.getFullYear() - dateRight.getFullYear()
- }
- module.exports = differenceInCalendarYears
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