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<!DOCTYPE html>
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<title>JSDoc: Source: differenceInISOWeekYears/index.js</title>
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<h1 class="page-title">Source: differenceInISOWeekYears/index.js</h1>
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<pre class="prettyprint source linenums"><code>import toDate from '../toDate/index'
import differenceInCalendarISOWeekYears from '../differenceInCalendarISOWeekYears/index'
import compareAsc from '../compareAsc/index'
import subISOWeekYears from '../subISOWeekYears/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name differenceInISOWeekYears
* @category ISO Week-Numbering Year Helpers
* @summary Get the number of full ISO week-numbering years between the given dates.
*
* @description
* Get the number of full ISO week-numbering years between the given dates.
*
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
*
* ### 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).
*
* - The function was renamed from `differenceInISOYears` to `differenceInISOWeekYears`.
* "ISO week year" is short for [ISO week-numbering year](https://en.wikipedia.org/wiki/ISO_week_date).
* This change makes the name consistent with
* locale-dependent week-numbering year helpers, e.g., `addWeekYears`.
*
* @param {Date|Number} dateLeft - the later date
* @param {Date|Number} dateRight - the earlier date
* @returns {Number} the number of full ISO week-numbering years
* @throws {TypeError} 2 arguments required
*
* @example
* // How many full ISO week-numbering years are between 1 January 2010 and 1 January 2012?
* var result = differenceInISOWeekYears(
* new Date(2012, 0, 1),
* new Date(2010, 0, 1)
* )
* //=> 1
*/
export default function differenceInISOWeekYears(
dirtyDateLeft,
dirtyDateRight
) {
requiredArgs(2, arguments)
var dateLeft = toDate(dirtyDateLeft)
var dateRight = toDate(dirtyDateRight)
var sign = compareAsc(dateLeft, dateRight)
var difference = Math.abs(
differenceInCalendarISOWeekYears(dateLeft, dateRight)
)
dateLeft = subISOWeekYears(dateLeft, sign * difference)
// Math.abs(diff in full ISO years - diff in calendar ISO years) === 1
// if last calendar ISO year is not full
// If so, result must be decreased by 1 in absolute value
var isLastISOWeekYearNotFull = compareAsc(dateLeft, dateRight) === -sign
var result = sign * (difference - isLastISOWeekYearNotFull)
// Prevent negative zero
return result === 0 ? 0 : result
}
</code></pre>
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