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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example 中文版: 时间</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'xml';
}
if (e.key == "ArrowRight") {
window.location.href = 'epoch';
}
}
</script>
<body>
<div class="example" id="time">
<h2><a href="./">Go by Example 中文版</a>: 时间</h2>
<table>
<tr>
<td class="docs">
<p>Go 为时间（time）和时间段（duration）提供了大量的支持；这儿有是一些例子。</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://play.studygolang.com/p/w7A-KyYZPpy"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"time"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">p</span> <span class="o">:=</span> <span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>从获取当前时间时间开始。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">now</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nf">Now</span><span class="p">()</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">now</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>通过提供年月日等信息，你可以构建一个 <code>time</code>。
时间总是与 <code>Location</code> 有关，也就是时区。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">then</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nf">Date</span><span class="p">(</span>
<span class="mi">2009</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="mi">17</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">34</span><span class="p">,</span> <span class="mi">58</span><span class="p">,</span> <span class="mi">651387237</span><span class="p">,</span> <span class="nx">time</span><span class="p">.</span><span class="nx">UTC</span><span class="p">)</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>你可以提取出时间的各个组成部分。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Year</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Month</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Day</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Hour</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Minute</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Second</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Nanosecond</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Location</span><span class="p">())</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>支持通过 <code>Weekday</code> 输出星期一到星期日。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Weekday</span><span class="p">())</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>这些方法用来比较两个时间，分别测试一下是否为之前、之后或者是同一时刻，精确到秒。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Before</span><span class="p">(</span><span class="nx">now</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">After</span><span class="p">(</span><span class="nx">now</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Equal</span><span class="p">(</span><span class="nx">now</span><span class="p">))</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>方法 <code>Sub</code> 返回一个 <code>Duration</code> 来表示两个时间点的间隔时间。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">diff</span> <span class="o">:=</span> <span class="nx">now</span><span class="p">.</span><span class="nf">Sub</span><span class="p">(</span><span class="nx">then</span><span class="p">)</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>我们可以用各种单位来表示时间段的长度。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nf">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nf">Hours</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nf">Minutes</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nf">Seconds</span><span class="p">())</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nf">Nanoseconds</span><span class="p">())</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>你可以使用 <code>Add</code> 将时间后移一个时间段，或者使用一个 <code>-</code> 来将时间前移一个时间段。</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Add</span><span class="p">(</span><span class="nx">diff</span><span class="p">))</span>
<span class="nf">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nf">Add</span><span class="p">(</span><span class="o">-</span><span class="nx">diff</span><span class="p">))</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="gp">$</span> go run time.go
<span class="go">2012-10-31 15:50:13.793654 +0000 UTC
</span><span class="go">2009-11-17 20:34:58.651387237 +0000 UTC
</span><span class="go">2009
</span><span class="go">November
</span><span class="go">17
</span><span class="go">20
</span><span class="go">34
</span><span class="go">58
</span><span class="go">651387237
</span><span class="go">UTC
</span><span class="go">Tuesday
</span><span class="go">true
</span><span class="go">false
</span><span class="go">false
</span><span class="go">25891h15m15.142266763s
</span><span class="go">25891.25420618521
</span><span class="go">1.5534752523711128e+06
</span><span class="go">9.320851514226677e+07
</span><span class="go">93208515142266763
</span><span class="go">2012-10-31 15:50:13.793654 +0000 UTC
</span><span class="go">2006-12-05 01:19:43.509120474 +0000 UTC</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>接下来，我们将研究与 Unix 纪元相关的概念。</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
下一个例子: <a href="epoch">时间戳</a>
</p>
<p class="footer">
<a href="https://twitter.com/mmcgrana">@mmcgrana</a> 和<a href="https://eli.thegreenplace.net">Eli Bendersky</a>编写 | <a href="https://github.com/gobyexample-cn">gobyexample-cn</a> 翻译 | <a href="https://github.com/gobyexample-cn/gobyexample/issues">反馈</a> | <a href="https://github.com/gobyexample-cn/gobyexample">源码</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a> </p>
</p>
</div>
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