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+---
+title: Date.prototype.getDay()
+slug: Web/JavaScript/Reference/Global_Objects/Date/getDay
+translation_of: Web/JavaScript/Reference/Global_Objects/Date/getDay
+---
+<div>{{JSRef}}</div>
+
+<p><span class="seoSummary"><strong><code>getDay()</code></strong> 方法會根據當地時間將指定日期返回一星期中的第幾天，</span>其中0代表星期日。 在當月的某天可以參考{{jsxref("Date.prototype.getDate()")}}。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/date-getday.html", "shorter")}}</div>
+
+<div class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</div>
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox notranslate"><code><var>dateObj</var>.getDay()</code></pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一個整數，數值介於0到6之間，取決於當地時間對應出指定日期為星期幾:0代表星期日，1代表星期一，2代表星期二，依此類推。</p>
+
+<h2 id="範例">範例</h2>
+
+<h3 id="使用_getDay">使用 <code>getDay()</code></h3>
+
+<p>下面第二行表示根據日期對象'Xmas95'的值，把1賦值給'weekday'。則1995年12月25日是星期一。</p>
+
+<pre class="brush: js notranslate">var Xmas95 = new Date('December 25, 1995 23:15:30');
+var weekday = Xmas95.getDay();
+
+console.log(weekday); // 1
+</pre>
+
+<div class="blockIndicator note">
+<p><strong>Note:</strong> 如果需要，可以使用{{jsxref("DateTimeFormat", "Intl.DateTimeFormat")}}加上<code>options</code>參數來獲取星期幾全名。使使用此方法能輕鬆做出各種國際語言：</p>
+
+<pre class="brush: js notranslate">var options = { weekday: 'long'};
+console.log(new Intl.DateTimeFormat('en-US', options).format(Xmas95));
+// Monday
+console.log(new Intl.DateTimeFormat('de-DE', options).format(Xmas95));
+// Montag
+</pre>
+</div>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-date.prototype.getday', 'Date.prototype.getDay')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器兼容性">瀏覽器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Date.getDay")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Date.prototype.getUTCDate()")}}</li>
+ <li>{{jsxref("Date.prototype.getUTCDay()")}}</li>
+ <li>{{jsxref("Date.prototype.setDate()")}}</li>
+</ul>