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33 lines
1.0 KiB
33 lines
1.0 KiB
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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