31 lines
1 KiB
JavaScript
31 lines
1 KiB
JavaScript
var startOfISOYear = require('../start_of_iso_year/index.js')
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/**
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* @category ISO Week-Numbering Year Helpers
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* @summary Are the given dates in the same ISO week-numbering year?
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*
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* @description
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* Are the given dates in the same ISO week-numbering year?
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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} dateLeft - the first date to check
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* @param {Date|String|Number} dateRight - the second date to check
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* @returns {Boolean} the dates are in the same ISO week-numbering year
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*
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* @example
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* // Are 29 December 2003 and 2 January 2005 in the same ISO week-numbering year?
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* var result = isSameISOYear(
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* new Date(2003, 11, 29),
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* new Date(2005, 0, 2)
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* )
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* //=> true
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*/
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function isSameISOYear (dirtyDateLeft, dirtyDateRight) {
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var dateLeftStartOfYear = startOfISOYear(dirtyDateLeft)
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var dateRightStartOfYear = startOfISOYear(dirtyDateRight)
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return dateLeftStartOfYear.getTime() === dateRightStartOfYear.getTime()
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}
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module.exports = isSameISOYear
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