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getISOWeek_index.js.html
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<h1 class="page-title">Source: getISOWeek/index.js</h1>
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<pre class="prettyprint source linenums"><code>import toDate from '../toDate/index'
import startOfISOWeek from '../startOfISOWeek/index'
import startOfISOWeekYear from '../startOfISOWeekYear/index'
import requiredArgs from '../_lib/requiredArgs/index'
var MILLISECONDS_IN_WEEK = 604800000
/**
* @name getISOWeek
* @category ISO Week Helpers
* @summary Get the ISO week of the given date.
*
* @description
* Get the ISO week of the given date.
*
* 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 given date
* @returns {Number} the ISO week
* @throws {TypeError} 1 argument required
*
* @example
* // Which week of the ISO-week numbering year is 2 January 2005?
* var result = getISOWeek(new Date(2005, 0, 2))
* //=> 53
*/
export default function getISOWeek(dirtyDate) {
requiredArgs(1, arguments)
var date = toDate(dirtyDate)
var diff = startOfISOWeek(date).getTime() - startOfISOWeekYear(date).getTime()
// Round the number of days to the nearest integer
// because the number of milliseconds in a week is not constant
// (e.g. it's different in the week of the daylight saving time clock shift)
return Math.round(diff / MILLISECONDS_IN_WEEK) + 1
}
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<h2><a href="index.html">Home</a></h2><h3>Global</h3><ul><li><a href="global.html#add">add</a></li><li><a href="global.html#addBusinessDays">addBusinessDays</a></li><li><a href="global.html#addDays">addDays</a></li><li><a href="global.html#addHours">addHours</a></li><li><a href="global.html#addISOWeekYears">addISOWeekYears</a></li><li><a href="global.html#addMilliseconds">addMilliseconds</a></li><li><a href="global.html#addMinutes">addMinutes</a></li><li><a href="global.html#addMonths">addMonths</a></li><li><a href="global.html#addQuarters">addQuarters</a></li><li><a href="global.html#addSeconds">addSeconds</a></li><li><a href="global.html#addWeeks">addWeeks</a></li><li><a href="global.html#addYears">addYears</a></li><li><a href="global.html#areIntervalsOverlapping">areIntervalsOverlapping</a></li><li><a href="global.html#closestIndexTo">closestIndexTo</a></li><li><a href="global.html#closestTo">closestTo</a></li><li><a href="global.html#compareAsc">compareAsc</a></li><li><a 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