index.js
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import toInteger from '../_lib/toInteger/index.js';
import toDate from '../toDate/index.js';
import addDays from '../addDays/index.js';
import getISODay from '../getISODay/index.js';
import requiredArgs from '../_lib/requiredArgs/index.js';
/**
* @name setISODay
* @category Weekday Helpers
* @summary Set the day of the ISO week to the given date.
*
* @description
* Set the day of the ISO week to the given date.
* ISO week starts with Monday.
* 7 is the index of Sunday, 1 is the index of Monday etc.
*
* ### 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} day - the day of the ISO week of the new date
* @returns {Date} the new date with the day of the ISO week set
* @throws {TypeError} 2 arguments required
*
* @example
* // Set Sunday to 1 September 2014:
* var result = setISODay(new Date(2014, 8, 1), 7)
* //=> Sun Sep 07 2014 00:00:00
*/
export default function setISODay(dirtyDate, dirtyDay) {
requiredArgs(2, arguments);
var date = toDate(dirtyDate);
var day = toInteger(dirtyDay);
var currentDay = getISODay(date);
var diff = day - currentDay;
return addDays(date, diff);
}