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21 lines
510 B
21 lines
510 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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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://262.ecma-international.org/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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