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32 lines
968 B
32 lines
968 B
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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