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21 lines
858 B
JavaScript
21 lines
858 B
JavaScript
// Copyright (C) 2020 Kevin Gibbons. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-date.utc
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description: arithmetic in Date is done on floating-point numbers
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info: |
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[...]
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Return TimeClip(MakeDate(MakeDay(yr, m, dt), MakeTime(h, min, s, milli))).
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#sec-maketime
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Let _t_ be ((_h_ `*` msPerHour `+` _m_ `*` msPerMinute) `+` _s_ `*` msPerSecond) `+` _milli_, performing the arithmetic according to IEEE 754-2019 rules (that is, as if using the ECMAScript operators `*` and `+`).
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#sec-makedate
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Return day × msPerDay + time.
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---*/
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assert.sameValue(Date.UTC(1970, 0, 1, 80063993375, 29, 1, -288230376151711740), 29312, 'order of operations / precision in MakeTime');
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assert.sameValue(Date.UTC(1970, 0, 213503982336, 0, 0, 0, -18446744073709552000), 34447360, 'precision in MakeDate');
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