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differenceInCalendarISOWeeks_index.js.html
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<!DOCTYPE html>
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<h1 class="page-title">Source: differenceInCalendarISOWeeks/index.js</h1>
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<pre class="prettyprint source linenums"><code>import getTimezoneOffsetInMilliseconds from '../_lib/getTimezoneOffsetInMilliseconds/index'
import startOfISOWeek from '../startOfISOWeek/index'
import requiredArgs from '../_lib/requiredArgs/index'
var MILLISECONDS_IN_WEEK = 604800000
/**
* @name differenceInCalendarISOWeeks
* @category ISO Week Helpers
* @summary Get the number of calendar ISO weeks between the given dates.
*
* @description
* Get the number of calendar ISO weeks 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).
*
* @param {Date|Number} dateLeft - the later date
* @param {Date|Number} dateRight - the earlier date
* @returns {Number} the number of calendar ISO weeks
* @throws {TypeError} 2 arguments required
*
* @example
* // How many calendar ISO weeks are between 6 July 2014 and 21 July 2014?
* var result = differenceInCalendarISOWeeks(
* new Date(2014, 6, 21),
* new Date(2014, 6, 6)
* )
* //=> 3
*/
export default function differenceInCalendarISOWeeks(
dirtyDateLeft,
dirtyDateRight
) {
requiredArgs(2, arguments)
var startOfISOWeekLeft = startOfISOWeek(dirtyDateLeft)
var startOfISOWeekRight = startOfISOWeek(dirtyDateRight)
var timestampLeft =
startOfISOWeekLeft.getTime() -
getTimezoneOffsetInMilliseconds(startOfISOWeekLeft)
var timestampRight =
startOfISOWeekRight.getTime() -
getTimezoneOffsetInMilliseconds(startOfISOWeekRight)
// 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((timestampLeft - timestampRight) / MILLISECONDS_IN_WEEK)
}
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