36 lines
1.1 KiB
JavaScript
36 lines
1.1 KiB
JavaScript
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import toDate from '../toDate/index.js';
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/**
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* @name getDaysInMonth
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* @category Month Helpers
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* @summary Get the number of days in a month of the given date.
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*
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* @description
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* Get the number of days in a month of 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 given date
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* @returns {Number} the number of days in a month
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // How many days are in February 2000?
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* var result = getDaysInMonth(new Date(2000, 1))
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* //=> 29
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*/
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export default function getDaysInMonth(dirtyDate) {
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if (arguments.length < 1) {
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throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
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}
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var date = toDate(dirtyDate);
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var year = date.getFullYear();
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var monthIndex = date.getMonth();
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var lastDayOfMonth = new Date(0);
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lastDayOfMonth.setFullYear(year, monthIndex + 1, 0);
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lastDayOfMonth.setHours(0, 0, 0, 0);
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return lastDayOfMonth.getDate();
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}
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