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differenceInYears_index.js.html
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<h1 class="page-title">Source: differenceInYears/index.js</h1>
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<pre class="prettyprint source linenums"><code>import toDate from '../toDate/index'
import differenceInCalendarYears from '../differenceInCalendarYears/index'
import compareAsc from '../compareAsc/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @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?
* var 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 - isLastYearNotFull)
// Prevent negative zero
return result === 0 ? 0 : result
}
</code></pre>
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