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54 lines
1.0 KiB
54 lines
1.0 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $EvalError = GetIntrinsic('%EvalError%'); |
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var DayWithinYear = require('./DayWithinYear'); |
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var InLeapYear = require('./InLeapYear'); |
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var MonthFromTime = require('./MonthFromTime'); |
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// https://262.ecma-international.org/5.1/#sec-15.9.1.5 |
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module.exports = function DateFromTime(t) { |
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var m = MonthFromTime(t); |
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var d = DayWithinYear(t); |
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if (m === 0) { |
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return d + 1; |
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} |
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if (m === 1) { |
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return d - 30; |
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} |
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var leap = InLeapYear(t); |
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if (m === 2) { |
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return d - 58 - leap; |
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} |
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if (m === 3) { |
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return d - 89 - leap; |
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} |
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if (m === 4) { |
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return d - 119 - leap; |
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} |
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if (m === 5) { |
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return d - 150 - leap; |
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} |
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if (m === 6) { |
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return d - 180 - leap; |
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} |
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if (m === 7) { |
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return d - 211 - leap; |
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} |
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if (m === 8) { |
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return d - 242 - leap; |
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} |
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if (m === 9) { |
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return d - 272 - leap; |
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} |
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if (m === 10) { |
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return d - 303 - leap; |
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} |
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if (m === 11) { |
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return d - 333 - leap; |
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} |
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throw new $EvalError('Assertion failed: MonthFromTime returned an impossible value: ' + m); |
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};
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