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22 lines
517 B
JavaScript
22 lines
517 B
JavaScript
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'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var $EvalError = GetIntrinsic('%EvalError%');
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var DaysInYear = require('./DaysInYear');
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var YearFromTime = require('./YearFromTime');
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// https://ecma-international.org/ecma-262/5.1/#sec-15.9.1.3
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module.exports = function InLeapYear(t) {
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var days = DaysInYear(YearFromTime(t));
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if (days === 365) {
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return 0;
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}
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if (days === 366) {
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return 1;
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}
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throw new $EvalError('Assertion failed: there are not 365 or 366 days in a year, got: ' + days);
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};
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