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setISOWeek_index.js.html
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<h1 class="page-title">Source: setISOWeek/index.js</h1>
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<pre class="prettyprint source linenums"><code>import toInteger from '../_lib/toInteger/index'
import toDate from '../toDate/index'
import getISOWeek from '../getISOWeek/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name setISOWeek
* @category ISO Week Helpers
* @summary Set the ISO week to the given date.
*
* @description
* Set the ISO week to the given date, saving the weekday number.
*
* 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).
*
* @param {Date|Number} date - the date to be changed
* @param {Number} isoWeek - the ISO week of the new date
* @returns {Date} the new date with the ISO week set
* @throws {TypeError} 2 arguments required
*
* @example
* // Set the 53rd ISO week to 7 August 2004:
* var result = setISOWeek(new Date(2004, 7, 7), 53)
* //=> Sat Jan 01 2005 00:00:00
*/
export default function setISOWeek(dirtyDate, dirtyISOWeek) {
requiredArgs(2, arguments)
var date = toDate(dirtyDate)
var isoWeek = toInteger(dirtyISOWeek)
var diff = getISOWeek(date) - isoWeek
date.setDate(date.getDate() - diff * 7)
return date
}
</code></pre>
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