39 lines
1.5 KiB
JavaScript
39 lines
1.5 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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import requiredArgs from "../_lib/requiredArgs/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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* @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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* const 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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requiredArgs(2, arguments);
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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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