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