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37 lines
1.3 KiB
37 lines
1.3 KiB
4 years ago
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var parse = require('../parse/index.js')
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var startOfISOYear = require('../start_of_iso_year/index.js')
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var differenceInCalendarDays = require('../difference_in_calendar_days/index.js')
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/**
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* @category ISO Week-Numbering Year Helpers
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* @summary Set the ISO week-numbering year to the given date.
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*
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* @description
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* Set the ISO week-numbering year to the given date,
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* saving the week number and the weekday number.
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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} isoYear - the ISO week-numbering year of the new date
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* @returns {Date} the new date with the ISO week-numbering year setted
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*
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* @example
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* // Set ISO week-numbering year 2007 to 29 December 2008:
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* var result = setISOYear(new Date(2008, 11, 29), 2007)
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* //=> Mon Jan 01 2007 00:00:00
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*/
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function setISOYear (dirtyDate, dirtyISOYear) {
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var date = parse(dirtyDate)
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var isoYear = Number(dirtyISOYear)
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var diff = differenceInCalendarDays(date, startOfISOYear(date))
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var fourthOfJanuary = new Date(0)
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fourthOfJanuary.setFullYear(isoYear, 0, 4)
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fourthOfJanuary.setHours(0, 0, 0, 0)
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date = startOfISOYear(fourthOfJanuary)
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date.setDate(date.getDate() + diff)
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return date
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}
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module.exports = setISOYear
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