| Leo Repp | 58b9f11 | 2021-11-22 11:57:47 +0100 | [diff] [blame^] | 1 | 'use strict'; |
| 2 | |
| 3 | var GetIntrinsic = require('get-intrinsic'); |
| 4 | |
| 5 | var $EvalError = GetIntrinsic('%EvalError%'); |
| 6 | |
| 7 | var DaysInYear = require('./DaysInYear'); |
| 8 | var YearFromTime = require('./YearFromTime'); |
| 9 | |
| 10 | // https://262.ecma-international.org/5.1/#sec-15.9.1.3 |
| 11 | |
| 12 | module.exports = function InLeapYear(t) { |
| 13 | var days = DaysInYear(YearFromTime(t)); |
| 14 | if (days === 365) { |
| 15 | return 0; |
| 16 | } |
| 17 | if (days === 366) { |
| 18 | return 1; |
| 19 | } |
| 20 | throw new $EvalError('Assertion failed: there are not 365 or 366 days in a year, got: ' + days); |
| 21 | }; |