34 lines
1.0 KiB
JavaScript
34 lines
1.0 KiB
JavaScript
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var getQuarter = require('../get_quarter/index.js')
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var parse = require('../parse/index.js')
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/**
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* @category Quarter Helpers
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* @summary Get the number of calendar quarters between the given dates.
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*
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* @description
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* Get the number of calendar quarters 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 quarters
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*
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* @example
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* // How many calendar quarters are between 31 December 2013 and 2 July 2014?
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* var result = differenceInCalendarQuarters(
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* new Date(2014, 6, 2),
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* new Date(2013, 11, 31)
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* )
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* //=> 3
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*/
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function differenceInCalendarQuarters (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 quarterDiff = getQuarter(dateLeft) - getQuarter(dateRight)
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return yearDiff * 4 + quarterDiff
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}
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module.exports = differenceInCalendarQuarters
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