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38 lines
1.2 KiB
JavaScript
38 lines
1.2 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. 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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es6id: 20.3.2
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description: Subclassing the String object
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info: |
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20.3.2 The Date Constructor
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...
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The Date constructor is a single function whose behaviour is overloaded based
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upon the number and types of its arguments.
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The Date constructor is designed to be subclassable. It may be used as the
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value of an extends clause of a class definition. Subclass constructors that
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intend to inherit the specified Date behaviour must include a super call to
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the Date constructor to create and initialize the subclass instance with a
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[[DateValue]] internal slot.
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---*/
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class D extends Date {}
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var d1 = new D(1859, '10', 24, 11);
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assert.sameValue(d1.getFullYear(), 1859);
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assert.sameValue(d1.getMonth(), 10);
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assert.sameValue(d1.getDate(), 24);
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var d2 = new D(-3474558000000);
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assert.sameValue(d2.getUTCFullYear(), 1859);
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assert.sameValue(d2.getUTCMonth(), 10);
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assert.sameValue(d2.getUTCDate(), 24);
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var d3 = new D();
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var d4 = new Date();
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assert.sameValue(d3.getFullYear(), d4.getFullYear());
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assert.sameValue(d3.getMonth(), d4.getMonth());
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assert.sameValue(d3.getDate(), d4.getDate());
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