index.js
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import toInteger from '../_lib/toInteger/index.js';
import toDate from '../toDate/index.js';
import getDaysInMonth from '../getDaysInMonth/index.js';
import requiredArgs from '../_lib/requiredArgs/index.js';
/**
* @name setMonth
* @category Month Helpers
* @summary Set the month to the given date.
*
* @description
* Set the month to the given 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} month - the month of the new date
* @returns {Date} the new date with the month set
* @throws {TypeError} 2 arguments required
*
* @example
* // Set February to 1 September 2014:
* var result = setMonth(new Date(2014, 8, 1), 1)
* //=> Sat Feb 01 2014 00:00:00
*/
export default function setMonth(dirtyDate, dirtyMonth) {
requiredArgs(2, arguments);
var date = toDate(dirtyDate);
var month = toInteger(dirtyMonth);
var year = date.getFullYear();
var day = date.getDate();
var dateWithDesiredMonth = new Date(0);
dateWithDesiredMonth.setFullYear(year, month, 15);
dateWithDesiredMonth.setHours(0, 0, 0, 0);
var daysInMonth = getDaysInMonth(dateWithDesiredMonth); // Set the last day of the new month
// if the original date was the last day of the longer month
date.setMonth(month, Math.min(day, daysInMonth));
return date;
}