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After go1.16, go will use module mode by default, even when the repository is checked out under GOPATH or in a one-off directory. Add go.mod, go.sum to keep this repo buildable without opting out of the module mode. > go mod init github.com/mmcgrana/gobyexample > go mod tidy > go mod vendor In module mode, the 'vendor' directory is special and its contents will be actively maintained by the go command. pygments aren't the dependency the go will know about, so it will delete the contents from vendor directory. Move it to `third_party` directory now. And, vendor the blackfriday package. Note: the tutorial contents are not affected by the change in go1.16 because all the examples in this tutorial ask users to run the go command with the explicit list of files to be compiled (e.g. `go run hello-world.go` or `go build command-line-arguments.go`). When the source list is provided, the go command does not have to compute the build list and whether it's running in GOPATH mode or module mode becomes irrelevant.
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185 lines
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Go by Example: Epoch</title>
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<link rel=stylesheet href="site.css">
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</head>
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<script>
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onkeydown = (e) => {
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if (e.key == "ArrowLeft") {
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window.location.href = 'time';
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}
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if (e.key == "ArrowRight") {
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window.location.href = 'time-formatting-parsing';
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}
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}
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</script>
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<body>
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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="http://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="http://play.golang.org/p/0ooeler0RfR"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
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</pre></div>
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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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<div class="highlight"><pre><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></div>
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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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<div class="highlight"><pre><span class="kd">func</span> <span class="nx">main</span><span class="p">()</span> <span class="p">{</span>
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</pre></div>
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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> or <code>UnixNano</code> to get
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elapsed time since the Unix epoch in seconds or
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nanoseconds, respectively.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">now</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Now</span><span class="p">()</span>
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<span class="nx">secs</span> <span class="o">:=</span> <span class="nx">now</span><span class="p">.</span><span class="nx">Unix</span><span class="p">()</span>
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<span class="nx">nanos</span> <span class="o">:=</span> <span class="nx">now</span><span class="p">.</span><span class="nx">UnixNano</span><span class="p">()</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">now</span><span class="p">)</span>
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</pre></div>
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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>Note that there is no <code>UnixMillis</code>, so to get the
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milliseconds since epoch you’ll need to manually
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divide from nanoseconds.</p>
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</td>
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<td class="code leading">
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<div class="highlight"><pre> <span class="nx">millis</span> <span class="o">:=</span> <span class="nx">nanos</span> <span class="o">/</span> <span class="mi">1000000</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">secs</span><span class="p">)</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">millis</span><span class="p">)</span>
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<span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">nanos</span><span class="p">)</span>
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</pre></div>
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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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<div class="highlight"><pre> <span class="nx">fmt</span><span class="p">.</span><span class="nx">Println</span><span class="p">(</span><span class="nx">time</span><span class="p">.</span><span class="nx">Unix</span><span class="p">(</span><span class="nx">secs</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="nx">Println</span><span class="p">(</span><span class="nx">time</span><span class="p">.</span><span class="nx">Unix</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="nx">nanos</span><span class="p">))</span>
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<span class="p">}</span>
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</pre></div>
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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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<div class="highlight"><pre><span class="gp">$</span> go run epoch.go
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<span class="go">2012-10-31 16:13:58.292387 +0000 UTC</span>
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<span class="go">1351700038</span>
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<span class="go">1351700038292</span>
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<span class="go">1351700038292387000</span>
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<span class="go">2012-10-31 16:13:58 +0000 UTC</span>
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<span class="go">2012-10-31 16:13:58.292387 +0000 UTC</span>
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</pre></div>
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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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<p class="footer">
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by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/epoch">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
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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 secs :\u003D now.Unix()\u000A nanos :\u003D now.UnixNano()\u000A fmt.Println(now)\u000A');codeLines.push(' millis :\u003D nanos / 1000000\u000A fmt.Println(secs)\u000A fmt.Println(millis)\u000A fmt.Println(nanos)\u000A');codeLines.push(' fmt.Println(time.Unix(secs, 0))\u000A fmt.Println(time.Unix(0, nanos))\u000A}\u000A');codeLines.push('');codeLines.push('');
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</script>
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<script src="site.js" async></script>
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</body>
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</html>
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