32 lines
1.1 KiB
JavaScript
32 lines
1.1 KiB
JavaScript
import toDate from "../toDate/index.js";
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import requiredArgs from "../_lib/requiredArgs/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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* @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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* const 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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requiredArgs(2, arguments);
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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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} |