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var parse = require('../parse/index.js') var startOfISOWeek = require('../start_of_iso_week/index.js') /** * @category ISO Week-Numbering Year Helpers * @summary Get the ISO week-numbering year of the given date. * * @description * Get the ISO week-numbering year of the given date, * which always starts 3 days before the year's first Thursday. * * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date * * @param {Date|String|Number} date - the given date * @returns {Number} the ISO week-numbering year * * @example * // Which ISO-week numbering year is 2 January 2005? * var result = getISOYear(new Date(2005, 0, 2)) * //=> 2004 */ function getISOYear (dirtyDate) { var date = parse(dirtyDate) var year = date.getFullYear() var fourthOfJanuaryOfNextYear = new Date(0) fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4) fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0) var startOfNextYear = startOfISOWeek(fourthOfJanuaryOfNextYear) var fourthOfJanuaryOfThisYear = new Date(0) fourthOfJanuaryOfThisYear.setFullYear(year, 0, 4) fourthOfJanuaryOfThisYear.setHours(0, 0, 0, 0) var startOfThisYear = startOfISOWeek(fourthOfJanuaryOfThisYear) if (date.getTime() >= startOfNextYear.getTime()) { return year + 1 } else if (date.getTime() >= startOfThisYear.getTime()) { return year } else { return year - 1 } } module.exports = getISOYear
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