27 lines
959 B
JavaScript
27 lines
959 B
JavaScript
var getISOYear = require('../get_iso_year/index.js')
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var setISOYear = require('../set_iso_year/index.js')
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/**
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* @category ISO Week-Numbering Year Helpers
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* @summary Add the specified number of ISO week-numbering years to the given date.
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*
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* @description
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* Add the specified number of ISO week-numbering years to the given date.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @param {Date|String|Number} date - the date to be changed
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* @param {Number} amount - the amount of ISO week-numbering years to be added
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* @returns {Date} the new date with the ISO week-numbering years added
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*
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* @example
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* // Add 5 ISO week-numbering years to 2 July 2010:
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* var result = addISOYears(new Date(2010, 6, 2), 5)
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* //=> Fri Jun 26 2015 00:00:00
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*/
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function addISOYears (dirtyDate, dirtyAmount) {
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var amount = Number(dirtyAmount)
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return setISOYear(dirtyDate, getISOYear(dirtyDate) + amount)
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}
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module.exports = addISOYears
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