50 lines
2.0 KiB
JavaScript
50 lines
2.0 KiB
JavaScript
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import toInteger from '../_lib/toInteger/index.js';
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import toDate from '../toDate/index.js';
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import startOfISOWeekYear from '../startOfISOWeekYear/index.js';
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import differenceInCalendarDays from '../differenceInCalendarDays/index.js';
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/**
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* @name setISOWeekYear
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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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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* - The function was renamed from `setISOYear` to `setISOWeekYear`.
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* "ISO week year" is short for [ISO week-numbering year](https://en.wikipedia.org/wiki/ISO_week_date).
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* This change makes the name consistent with
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* locale-dependent week-numbering year helpers, e.g., `setWeekYear`.
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*
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* @param {Date|Number} date - the date to be changed
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* @param {Number} isoWeekYear - the ISO week-numbering year of the new date
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* @returns {Date} the new date with the ISO week-numbering year set
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* @throws {TypeError} 2 arguments required
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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 = setISOWeekYear(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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export default function setISOWeekYear(dirtyDate, dirtyISOWeekYear) {
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if (arguments.length < 2) {
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throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
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}
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var date = toDate(dirtyDate);
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var isoWeekYear = toInteger(dirtyISOWeekYear);
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var diff = differenceInCalendarDays(date, startOfISOWeekYear(date));
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var fourthOfJanuary = new Date(0);
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fourthOfJanuary.setFullYear(isoWeekYear, 0, 4);
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fourthOfJanuary.setHours(0, 0, 0, 0);
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date = startOfISOWeekYear(fourthOfJanuary);
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date.setDate(date.getDate() + diff);
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return date;
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}
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