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differenceInCalendarISOWeekYears_index.js.html
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<h1 class="page-title">Source: differenceInCalendarISOWeekYears/index.js</h1>
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<pre class="prettyprint source linenums"><code>import getISOWeekYear from '../getISOWeekYear/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name differenceInCalendarISOWeekYears
* @category ISO Week-Numbering Year Helpers
* @summary Get the number of calendar ISO week-numbering years between the given dates.
*
* @description
* Get the number of calendar 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 `differenceInCalendarISOYears` to `differenceInCalendarISOWeekYears`.
* "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 calendar ISO week-numbering years
* @throws {TypeError} 2 arguments required
*
* @example
* // How many calendar ISO week-numbering years are 1 January 2010 and 1 January 2012?
* var result = differenceInCalendarISOWeekYears(
* new Date(2012, 0, 1),
* new Date(2010, 0, 1)
* )
* //=> 2
*/
export default function differenceInCalendarISOWeekYears(
dirtyDateLeft,
dirtyDateRight
) {
requiredArgs(2, arguments)
return getISOWeekYear(dirtyDateLeft) - getISOWeekYear(dirtyDateRight)
}
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