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37 lines
1012 B
37 lines
1012 B
1 year ago
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'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 $isFinite = require('../helpers/isFinite');
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var DateFromTime = require('./DateFromTime');
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var Day = require('./Day');
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var floor = require('./floor');
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var modulo = require('./modulo');
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var MonthFromTime = require('./MonthFromTime');
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var ToIntegerOrInfinity = require('./ToIntegerOrInfinity');
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var YearFromTime = require('./YearFromTime');
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// https://ecma-international.org/ecma-262/5.1/#sec-15.9.1.12
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module.exports = function MakeDay(year, month, date) {
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if (!$isFinite(year) || !$isFinite(month) || !$isFinite(date)) {
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return NaN;
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}
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var y = ToIntegerOrInfinity(year);
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var m = ToIntegerOrInfinity(month);
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var dt = ToIntegerOrInfinity(date);
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var ym = y + floor(m / 12);
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if (!$isFinite(ym)) {
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return NaN;
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}
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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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