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epoch.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example 中文版: 时间戳</title>
<link rel=stylesheet href="site.css">
</head>
<script>
onkeydown = (e) => {
if (e.key == "ArrowLeft") {
window.location.href = 'time';
}
if (e.key == "ArrowRight") {
window.location.href = 'time-formatting-parsing';
}
}
</script>
<body>
<div class="example" id="epoch">
<h2><a href="./">Go by Example 中文版</a>: 时间戳</h2>
<table>
<tr>
<td class="docs">
<p>一般程序会有获取 <a href="http://zh.wikipedia.org/wiki/UNIX%E6%97%B6%E9%97%B4">Unix 时间</a>
的秒数，毫秒数，或者微秒数的需求。来看看如何用 Go 来实现。</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/nBJrzhuQrQF"><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>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>分别使用 <code>time.Now</code> 的 <code>Unix</code> 和 <code>UnixNano</code>，
来获取从 Unix 纪元起，到现在经过的秒数和纳秒数。</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="nx">secs</span> <span class="o">:=</span> <span class="nx">now</span><span class="p">.</span><span class="nf">Unix</span><span class="p">()</span>
<span class="nx">nanos</span> <span class="o">:=</span> <span class="nx">now</span><span class="p">.</span><span class="nf">UnixNano</span><span class="p">()</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">now</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>注意 <code>UnixMillis</code> 是不存在的，所以要得到毫秒数的话，
你需要手动的从纳秒转化一下。</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="nx">millis</span> <span class="o">:=</span> <span class="nx">nanos</span> <span class="o">/</span> <span class="mi">1000000</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">secs</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">millis</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">nanos</span><span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>你也可以将 Unix 纪元起的整数秒或者纳秒转化到相应的时间。</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">time</span><span class="p">.</span><span class="nf">Unix</span><span class="p">(</span><span class="nx">secs</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">time</span><span class="p">.</span><span class="nf">Unix</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nx">nanos</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 epoch.go
<span class="go">2012-10-31 16:13:58.292387 +0000 UTC
</span><span class="go">1351700038
</span><span class="go">1351700038292
</span><span class="go">1351700038292387000
</span><span class="go">2012-10-31 16:13:58 +0000 UTC
</span><span class="go">2012-10-31 16:13:58.292387 +0000 UTC</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>下面我们将看看另一个时间相关的任务：时间解析与格式化。</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
下一个例子: <a href="time-formatting-parsing">时间的格式化和解析</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>
<script>
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</body>
</html>