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x/date_fns/setISOWeek/index.ts

date-fns Deno package
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import toInteger from '../_lib/toInteger/index.ts'import toDate from '../toDate/index.ts'import getISOWeek from '../getISOWeek/index.ts'import requiredArgs from '../_lib/requiredArgs/index.ts'
/** * @name setISOWeek * @category ISO Week Helpers * @summary Set the ISO week to the given date. * * @description * Set the ISO week to the given date, saving the weekday number. * * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date * * ### v2.0.0 breaking changes: * * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes). * * @param {Date|Number} date - the date to be changed * @param {Number} isoWeek - the ISO week of the new date * @returns {Date} the new date with the ISO week set * @throws {TypeError} 2 arguments required * * @example * // Set the 53rd ISO week to 7 August 2004: * const result = setISOWeek(new Date(2004, 7, 7), 53) * //=> Sat Jan 01 2005 00:00:00 */export default function setISOWeek(dirtyDate: Date | number, dirtyISOWeek: number): Date { requiredArgs(2, arguments)
const date = toDate(dirtyDate) const isoWeek = toInteger(dirtyISOWeek) const diff = getISOWeek(date) - isoWeek date.setDate(date.getDate() - diff * 7) return date}