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