33 lines
968 B
JavaScript
33 lines
968 B
JavaScript
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var parse = require('../parse/index.js')
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/**
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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|String|Number} dateLeft - the later date
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* @param {Date|String|Number} dateRight - the earlier date
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* @returns {Number} the number of calendar months
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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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function differenceInCalendarMonths (dirtyDateLeft, dirtyDateRight) {
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var dateLeft = parse(dirtyDateLeft)
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var dateRight = parse(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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module.exports = differenceInCalendarMonths
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