import DeveloperError from './DeveloperError.js';
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/**
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* Determines if a given date is a leap year.
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*
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* @exports isLeapYear
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*
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* @param {Number} year The year to be tested.
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* @returns {Boolean} True if <code>year</code> is a leap year.
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*
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* @example
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* var leapYear = Cesium.isLeapYear(2000); // true
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*/
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function isLeapYear(year) {
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//>>includeStart('debug', pragmas.debug);
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if (year === null || isNaN(year)) {
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throw new DeveloperError('year is required and must be a number.');
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}
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//>>includeEnd('debug');
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return ((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0);
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}
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export default isLeapYear;
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