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33 lines
917 B
33 lines
917 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $DateUTC = GetIntrinsic('%Date.UTC%'); |
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var $isFinite = require('../helpers/isFinite'); |
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var DateFromTime = require('./DateFromTime'); |
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var Day = require('./Day'); |
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var floor = require('./floor'); |
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var modulo = require('./modulo'); |
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var MonthFromTime = require('./MonthFromTime'); |
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var ToInteger = require('./ToInteger'); |
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var YearFromTime = require('./YearFromTime'); |
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// https://262.ecma-international.org/5.1/#sec-15.9.1.12 |
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module.exports = function MakeDay(year, month, date) { |
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if (!$isFinite(year) || !$isFinite(month) || !$isFinite(date)) { |
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return NaN; |
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} |
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var y = ToInteger(year); |
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var m = ToInteger(month); |
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var dt = ToInteger(date); |
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var ym = y + floor(m / 12); |
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var mn = modulo(m, 12); |
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var t = $DateUTC(ym, mn, 1); |
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if (YearFromTime(t) !== ym || MonthFromTime(t) !== mn || DateFromTime(t) !== 1) { |
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return NaN; |
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} |
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return Day(t) + dt - 1; |
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};
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