38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
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import toDate from '../toDate/index.js';
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/**
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* @name differenceInCalendarMonths
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* @category Month Helpers
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* @summary Get the number of calendar months between the given dates.
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*
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* @description
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* Get the number of calendar months between the given dates.
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*
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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* @param {Date|Number} dateLeft - the later date
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* @param {Date|Number} dateRight - the earlier date
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* @returns {Number} the number of calendar months
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* @throws {TypeError} 2 arguments required
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*
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* @example
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* // How many calendar months are between 31 January 2014 and 1 September 2014?
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* var result = differenceInCalendarMonths(
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* new Date(2014, 8, 1),
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* new Date(2014, 0, 31)
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* )
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* //=> 8
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*/
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export default function differenceInCalendarMonths(dirtyDateLeft, dirtyDateRight) {
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if (arguments.length < 2) {
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throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
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}
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var dateLeft = toDate(dirtyDateLeft);
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var dateRight = toDate(dirtyDateRight);
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var yearDiff = dateLeft.getFullYear() - dateRight.getFullYear();
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var monthDiff = dateLeft.getMonth() - dateRight.getMonth();
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return yearDiff * 12 + monthDiff;
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}
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