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differenceInCalendarMonths_index.js.html
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<h1 class="page-title">Source: differenceInCalendarMonths/index.js</h1>
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<pre class="prettyprint source linenums"><code>import toDate from '../toDate/index'
import requiredArgs from '../_lib/requiredArgs/index'
/**
* @name differenceInCalendarMonths
* @category Month Helpers
* @summary Get the number of calendar months between the given dates.
*
* @description
* Get the number of calendar months between the given dates.
*
* ### 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 months
* @throws {TypeError} 2 arguments required
*
* @example
* // How many calendar months are between 31 January 2014 and 1 September 2014?
* var result = differenceInCalendarMonths(
* new Date(2014, 8, 1),
* new Date(2014, 0, 31)
* )
* //=> 8
*/
export default function differenceInCalendarMonths(
dirtyDateLeft,
dirtyDateRight
) {
requiredArgs(2, arguments)
var dateLeft = toDate(dirtyDateLeft)
var dateRight = toDate(dirtyDateRight)
var yearDiff = dateLeft.getFullYear() - dateRight.getFullYear()
var monthDiff = dateLeft.getMonth() - dateRight.getMonth()
return yearDiff * 12 + monthDiff
}
</code></pre>
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