216 lines
8.1 KiB
Plaintext
Generated
216 lines
8.1 KiB
Plaintext
Generated
<!DOCTYPE html>
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<html>
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<meta charset="utf-8">
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<title>Go by Example: Epoch</title>
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<div class="example" id="epoch">
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<h2><a href="./">Go by Example</a>: Epoch</h2>
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<table>
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<tr>
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<td class="docs">
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<p>A common requirement in programs is getting the number
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of seconds, milliseconds, or nanoseconds since the
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<a href="https://en.wikipedia.org/wiki/Unix_time">Unix epoch</a>.
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Here’s how to do it in Go.</p>
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</td>
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<td class="code empty leading">
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<a href="https://go.dev/play/p/lRmD1EWHHPz"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
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</pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
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<span class="s">"fmt"</span>
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<span class="s">"time"</span>
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<span class="p">)</span>
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</pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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</pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Use <code>time.Now</code> with <code>Unix</code>, <code>UnixMilli</code> or <code>UnixNano</code>
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to get elapsed time since the Unix epoch in seconds,
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milliseconds or nanoseconds, respectively.</p>
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</td>
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<td class="code leading">
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<pre class="chroma">
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<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>
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<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>
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</pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<pre class="chroma"> <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><span class="nf">Unix</span><span class="p">())</span>
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<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><span class="nf">UnixMilli</span><span class="p">())</span>
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<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><span class="nf">UnixNano</span><span class="p">())</span>
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</pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>You can also convert integer seconds or nanoseconds
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since the epoch into the corresponding <code>time</code>.</p>
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</td>
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<td class="code">
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<pre class="chroma">
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<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">now</span><span class="p">.</span><span class="nf">Unix</span><span class="p">(),</span> <span class="mi">0</span><span class="p">))</span>
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<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">now</span><span class="p">.</span><span class="nf">UnixNano</span><span class="p">()))</span>
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<span class="p">}</span>
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</pre>
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</td>
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</tr>
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</table>
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<table>
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<tr>
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<td class="docs">
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</td>
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<td class="code leading">
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<pre class="chroma"><span class="gp">$</span> go run epoch.go
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<span class="go">2012-10-31 16:13:58.292387 +0000 UTC
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</span><span class="go">1351700038
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</span><span class="go">1351700038292
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</span><span class="go">1351700038292387000
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</span><span class="go">2012-10-31 16:13:58 +0000 UTC
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</span><span class="go">2012-10-31 16:13:58.292387 +0000 UTC</span></pre>
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</td>
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</tr>
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<tr>
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<td class="docs">
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<p>Next we’ll look at another time-related task: time
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parsing and formatting.</p>
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</td>
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<td class="code empty">
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</td>
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</tr>
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</table>
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<p class="next">
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Next example: <a href="time-formatting-parsing">Time Formatting / Parsing</a>.
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</p>
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by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> and <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a> | <button id="theme-button">Toggle theme</button>
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</p>
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</div>
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<script>
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var codeLines = [];
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A');codeLines.push(' now :\u003D time.Now()\u000A fmt.Println(now)\u000A');codeLines.push(' fmt.Println(now.Unix())\u000A fmt.Println(now.UnixMilli())\u000A fmt.Println(now.UnixNano())\u000A');codeLines.push(' fmt.Println(time.Unix(now.Unix(), 0))\u000A fmt.Println(time.Unix(0, now.UnixNano()))\u000A}\u000A');codeLines.push('');codeLines.push('');
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