yeray/gobyexample
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
gobyexample/public/time
Hana 9e216da9ef go.mod: add go.mod and move pygments to third_party 
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.
2021-02-15 16:45:26 -05:00

278 lines
12 KiB
Plaintext
Generated
Raw Blame History

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example: Time</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</a>: Time</h2>
<table>
<tr>
<td class="docs">
<p>Go offers extensive support for times and durations;
here are some examples.</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="http://play.golang.org/p/YAM3s1KPc8c"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<div class="highlight"><pre><span class="kn">package</span> <span class="nx">main</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<div class="highlight"><pre><span class="kn">import</span> <span class="p">(</span>
<span class="s">&quot;fmt&quot;</span>
<span class="s">&quot;time&quot;</span>
<span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<div class="highlight"><pre><span class="kd">func</span> <span class="nx">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></div>
</td>
</tr>
<tr>
<td class="docs">
<p>We&rsquo;ll start by getting the current time.</p>
</td>
<td class="code leading">
<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>
<span class="nx">p</span><span class="p">(</span><span class="nx">now</span><span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>You can build a <code>time</code> struct by providing the
year, month, day, etc. Times are always associated
with a <code>Location</code>, i.e. time zone.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">then</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nx">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="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>You can extract the various components of the time
value as expected.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Year</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Month</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Day</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Hour</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Minute</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Second</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Nanosecond</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Location</span><span class="p">())</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>The Monday-Sunday <code>Weekday</code> is also available.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Weekday</span><span class="p">())</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>These methods compare two times, testing if the
first occurs before, after, or at the same time
as the second, respectively.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Before</span><span class="p">(</span><span class="nx">now</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">After</span><span class="p">(</span><span class="nx">now</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Equal</span><span class="p">(</span><span class="nx">now</span><span class="p">))</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>The <code>Sub</code> methods returns a <code>Duration</code> representing
the interval between two times.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">diff</span> <span class="o">:=</span> <span class="nx">now</span><span class="p">.</span><span class="nx">Sub</span><span class="p">(</span><span class="nx">then</span><span class="p">)</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>We can compute the length of the duration in
various units.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nx">Hours</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nx">Minutes</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nx">Seconds</span><span class="p">())</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">diff</span><span class="p">.</span><span class="nx">Nanoseconds</span><span class="p">())</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>You can use <code>Add</code> to advance a time by a given
duration, or with a <code>-</code> to move backwards by a
duration.</p>
</td>
<td class="code">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Add</span><span class="p">(</span><span class="nx">diff</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">then</span><span class="p">.</span><span class="nx">Add</span><span class="p">(</span><span class="o">-</span><span class="nx">diff</span><span class="p">))</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code leading">
<div class="highlight"><pre><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></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Next we&rsquo;ll look at the related idea of time relative to
the Unix epoch.</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
Next example: <a href="epoch">Epoch</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/time">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
<script>
var codeLines = [];
codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"time\"\u000A)\u000A');codeLines.push('func main() {\u000A p :\u003D fmt.Println\u000A');codeLines.push(' now :\u003D time.Now()\u000A p(now)\u000A');codeLines.push(' then :\u003D time.Date(\u000A 2009, 11, 17, 20, 34, 58, 651387237, time.UTC)\u000A p(then)\u000A');codeLines.push(' p(then.Year())\u000A p(then.Month())\u000A p(then.Day())\u000A p(then.Hour())\u000A p(then.Minute())\u000A p(then.Second())\u000A p(then.Nanosecond())\u000A p(then.Location())\u000A');codeLines.push(' p(then.Weekday())\u000A');codeLines.push(' p(then.Before(now))\u000A p(then.After(now))\u000A p(then.Equal(now))\u000A');codeLines.push(' diff :\u003D now.Sub(then)\u000A p(diff)\u000A');codeLines.push(' p(diff.Hours())\u000A p(diff.Minutes())\u000A p(diff.Seconds())\u000A p(diff.Nanoseconds())\u000A');codeLines.push(' p(then.Add(diff))\u000A p(then.Add(-diff))\u000A}\u000A');codeLines.push('');codeLines.push('');
</script>
<script src="site.js" async></script>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink