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31 lines
1.0 KiB
31 lines
1.0 KiB
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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