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var getISOYear = require('../get_iso_year/index.js') var startOfISOWeek = require('../start_of_iso_week/index.js') /** * @category ISO Week-Numbering Year Helpers * @summary Return the start of an ISO week-numbering year for the given date. * * @description * Return the start of an ISO week-numbering year, * which always starts 3 days before the year's first Thursday. * The result will be in the local timezone. * * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date * * @param {Date|String|Number} date - the original date * @returns {Date} the start of an ISO year * * @example * // The start of an ISO week-numbering year for 2 July 2005: * var result = startOfISOYear(new Date(2005, 6, 2)) * //=> Mon Jan 03 2005 00:00:00 */ function startOfISOYear (dirtyDate) { var year = getISOYear(dirtyDate) var fourthOfJanuary = new Date(0) fourthOfJanuary.setFullYear(year, 0, 4) fourthOfJanuary.setHours(0, 0, 0, 0) var date = startOfISOWeek(fourthOfJanuary) return date } module.exports = startOfISOYear
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