leetcode-problemset/leetcode-cn/problem (Chinese)/一周中的第几天 [day-of-the-week].html

<p>给你一个日期，请你设计一个算法来判断它是对应一周中的哪一天。</p>

<p>输入为三个整数：<code>day</code>、<code>month</code> 和&nbsp;<code>year</code>，分别表示日、月、年。</p>

<p>您返回的结果必须是这几个值中的一个&nbsp;<code>{&quot;Sunday&quot;, &quot;Monday&quot;, &quot;Tuesday&quot;, &quot;Wednesday&quot;, &quot;Thursday&quot;, &quot;Friday&quot;, &quot;Saturday&quot;}</code>。</p>

<p>&nbsp;</p>

<p><strong>示例 1：</strong></p>

<pre><strong>输入：</strong>day = 31, month = 8, year = 2019
<strong>输出：</strong>&quot;Saturday&quot;
</pre>

<p><strong>示例 2：</strong></p>

<pre><strong>输入：</strong>day = 18, month = 7, year = 1999
<strong>输出：</strong>&quot;Sunday&quot;
</pre>

<p><strong>示例 3：</strong></p>

<pre><strong>输入：</strong>day = 15, month = 8, year = 1993
<strong>输出：</strong>&quot;Sunday&quot;
</pre>

<p>&nbsp;</p>

<p><strong>提示：</strong></p>

<ul>
	<li>给出的日期一定是在&nbsp;<code>1971</code> 到&nbsp;<code>2100</code>&nbsp;年之间的有效日期。</li>
</ul>