var differenceInMonths = require('../difference_in_months/index.js')
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/**
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* @category Quarter Helpers
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* @summary Get the number of full quarters between the given dates.
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*
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* @description
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* Get the number of full 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 full quarters
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*
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* @example
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* // How many full quarters are between 31 December 2013 and 2 July 2014?
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* var result = differenceInQuarters(
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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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* //=> 2
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*/
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function differenceInQuarters (dirtyDateLeft, dirtyDateRight) {
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var diff = differenceInMonths(dirtyDateLeft, dirtyDateRight) / 3
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return diff > 0 ? Math.floor(diff) : Math.ceil(diff)
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}
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module.exports = differenceInQuarters
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