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---
title: Date.prototype.getUTCDay()
slug: Web/JavaScript/Reference/Global_Objects/Date/getUTCDay
translation_of: Web/JavaScript/Reference/Global_Objects/Date/getUTCDay
---
<div>{{JSRef("Global_Objects", "Date")}}</div>
<p><strong><code>getUTCDay()</code></strong> 方法以世界时为标准，返回一个指定的日期对象为一星期中的第几天，其中 0 代表星期天。</p>
<div>{{EmbedInteractiveExample("pages/js/date-getutcday.html")}}</div>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre class="syntaxbox"><code><var>dateObj</var>.getUTCDay()</code></pre>
<h3 id="Parameters" name="Parameters">参数</h3>
<p>无。</p>
<h3 id="Returns" name="Returns">返回值</h3>
<p><code>getUTCDay()</code> 方法返回一个对应一星期中第几天的整数：0 代表星期天，1 代表星期一，2 代表星期二，依次类推。</p>
<h2 id="Examples" name="Examples">例子</h2>
<h3 id="Example:_Using_getUTCDay" name="Example:_Using_getUTCDay">例子: 使用 <code>getUTCDay()</code> 方法</h3>
<p>下面的例子是把当前日期的星期部分赋值给变量 <code>weekday</code>。</p>
<pre class="brush: js">var today = new Date();
var weekday = today.getUTCDay();
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">规范版本</th>
<th scope="col">规范状态</th>
<th scope="col">注解</th>
</tr>
<tr>
<td>ECMAScript 1st Edition.</td>
<td>Standard</td>
<td>Initial definition. Implemented in JavaScript 1.3.</td>
</tr>
<tr>
<td>{{SpecName('ES5.1', '#sec-15.9.5.17', 'Date.prototype.getUTCDay')}}</td>
<td>{{Spec2('ES5.1')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-date.prototype.getutcday', 'Date.prototype.getUTCDay')}}</td>
<td>{{Spec2('ES6')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<div>
<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
<p>{{Compat("javascript.builtins.Date.getUTCDay")}}</p>
</div>
<h2 id="See_also" name="See_also">相关链接</h2>
<ul>
<li>{{jsxref("Date.prototype.getUTCDate()")}}</li>
<li>{{jsxref("Date.prototype.getDay()")}}</li>
<li>{{jsxref("Date.prototype.setUTCDate()")}}</li>
</ul>
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