32 lines
952 B
JavaScript
32 lines
952 B
JavaScript
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import toDate from '../toDate/index.js';
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/**
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* @name isLeapYear
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* @category Year Helpers
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* @summary Is the given date in the leap year?
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*
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* @description
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* Is the given date in the leap year?
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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 check
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* @returns {Boolean} the date is in the leap year
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* @throws {TypeError} 1 argument required
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*
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* @example
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* // Is 1 September 2012 in the leap year?
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* var result = isLeapYear(new Date(2012, 8, 1))
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* //=> true
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*/
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export default function isLeapYear(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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return year % 400 === 0 || year % 4 === 0 && year % 100 !== 0;
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}
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