---
title: Date.prototype.valueOf()
slug: Web/JavaScript/Reference/Global_Objects/Date/valueOf
translation_of: Web/JavaScript/Reference/Global_Objects/Date/valueOf
---
<div>{{JSRef}}</div>

<p><strong><code>valueOf()</code></strong> 함수는 {{jsxref("Date")}} 객체의 원시값을 반환합니다.</p>

<div>{{EmbedInteractiveExample("pages/js/date-valueof.html")}}</div>

<h2 id="Syntax">Syntax</h2>

<pre class="syntaxbox"><code><var>dateObj</var>.valueOf()</code></pre>

<h3 id="Return_value">Return value</h3>

<p>반환되는 milliseconds 값은 1 January 1970 00:00:00 UTC 와 주어진 일시 사이의 값입니다.</p>

<h2 id="Description">Description</h2>

<p><code>valueOf()</code> 함수는 01 January, 1970 UTC 이후의 milliseconds 단위의 자연수 타입인 {{jsxref("Date")}} 객체의 원시값을 반환합니다.</p>

<p>이 함수는 {{jsxref("Date.prototype.getTime()")}} 함수와 동일한 결과값을 반환합니다.</p>

<p>이 함수는 사용자 코드에 명시된 것이 아닌, JavaScript 자체에 포함되어 있습니다.</p>

<h2 id="Examples">Examples</h2>

<h3 id="Using_valueOf()">Using <code>valueOf()</code></h3>

<pre class="brush: js">var x = new Date(56, 6, 17);
var myVar = x.valueOf();      // myVar에 -424713600000를 할당합니다.
</pre>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('ES1')}}</td>
   <td>{{Spec2('ES1')}}</td>
   <td>최초 정의. JavaScript 1.1에서 구현</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.9.5.8', 'Date.prototype.valueOf')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td></td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-date.prototype.valueof', 'Date.prototype.valueOf')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td></td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-date.prototype.valueof', 'Date.prototype.valueOf')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td></td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>{{Compat("javascript.builtins.Date.valueOf")}}</p>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{jsxref("Object.prototype.valueOf()")}}</li>
 <li>{{jsxref("Date.prototype.getTime()")}}</li>
</ul>