39 lines
1.3 KiB
JavaScript
39 lines
1.3 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 getISOWeek from '../getISOWeek/index.js';
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/**
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* @name setISOWeek
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* @category ISO Week Helpers
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* @summary Set the ISO week to the given date.
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*
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* @description
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* Set the ISO week to the given date, saving 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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* @param {Date|Number} date - the date to be changed
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* @param {Number} isoWeek - the ISO week of the new date
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* @returns {Date} the new date with the ISO week set
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* @throws {TypeError} 2 arguments required
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*
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* @example
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* // Set the 53rd ISO week to 7 August 2004:
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* var result = setISOWeek(new Date(2004, 7, 7), 53)
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* //=> Sat Jan 01 2005 00:00:00
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*/
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export default function setISOWeek(dirtyDate, dirtyISOWeek) {
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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 isoWeek = toInteger(dirtyISOWeek);
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var diff = getISOWeek(date) - isoWeek;
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date.setDate(date.getDate() - diff * 7);
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return date;
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}
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