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gobyexample/public/time-formatting-parsing
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

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example: Time Formatting / Parsing</title>
<link rel=stylesheet href="site.css">
</head>
<script>
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<body>
<div class="example" id="time-formatting-parsing">
<h2><a href="./">Go by Example</a>: Time Formatting / Parsing</h2>
<table>
<tr>
<td class="docs">
<p>Go supports time formatting and parsing via
pattern-based layouts.</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/BoZYtr_2j66"><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>Here&rsquo;s a basic example of formatting a time
according to RFC3339, using the corresponding layout
constant.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">t</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">t</span><span class="p">.</span><span class="nx">Format</span><span class="p">(</span><span class="nx">time</span><span class="p">.</span><span class="nx">RFC3339</span><span class="p">))</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>Time parsing uses the same layout values as <code>Format</code>.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">t1</span><span class="p">,</span> <span class="nx">e</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Parse</span><span class="p">(</span>
<span class="nx">time</span><span class="p">.</span><span class="nx">RFC3339</span><span class="p">,</span>
<span class="s">&quot;2012-11-01T22:08:41+00:00&quot;</span><span class="p">)</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">t1</span><span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p><code>Format</code> and <code>Parse</code> use example-based layouts. Usually
you&rsquo;ll use a constant from <code>time</code> for these layouts, but
you can also supply custom layouts. Layouts must use the
reference time <code>Mon Jan 2 15:04:05 MST 2006</code> to show the
pattern with which to format/parse a given time/string.
The example time must be exactly as shown: the year 2006,
15 for the hour, Monday for the day of the week, etc.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">p</span><span class="p">(</span><span class="nx">t</span><span class="p">.</span><span class="nx">Format</span><span class="p">(</span><span class="s">&quot;3:04PM&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">t</span><span class="p">.</span><span class="nx">Format</span><span class="p">(</span><span class="s">&quot;Mon Jan _2 15:04:05 2006&quot;</span><span class="p">))</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">t</span><span class="p">.</span><span class="nx">Format</span><span class="p">(</span><span class="s">&quot;2006-01-02T15:04:05.999999-07:00&quot;</span><span class="p">))</span>
<span class="nx">form</span> <span class="o">:=</span> <span class="s">&quot;3 04 PM&quot;</span>
<span class="nx">t2</span><span class="p">,</span> <span class="nx">e</span> <span class="o">:=</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Parse</span><span class="p">(</span><span class="nx">form</span><span class="p">,</span> <span class="s">&quot;8 41 PM&quot;</span><span class="p">)</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">t2</span><span class="p">)</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p>For purely numeric representations you can also
use standard string formatting with the extracted
components of the time value.</p>
</td>
<td class="code leading">
<div class="highlight"><pre> <span class="nx">fmt</span><span class="p">.</span><span class="nx">Printf</span><span class="p">(</span><span class="s">&quot;%d-%02d-%02dT%02d:%02d:%02d-00:00\n&quot;</span><span class="p">,</span>
<span class="nx">t</span><span class="p">.</span><span class="nx">Year</span><span class="p">(),</span> <span class="nx">t</span><span class="p">.</span><span class="nx">Month</span><span class="p">(),</span> <span class="nx">t</span><span class="p">.</span><span class="nx">Day</span><span class="p">(),</span>
<span class="nx">t</span><span class="p">.</span><span class="nx">Hour</span><span class="p">(),</span> <span class="nx">t</span><span class="p">.</span><span class="nx">Minute</span><span class="p">(),</span> <span class="nx">t</span><span class="p">.</span><span class="nx">Second</span><span class="p">())</span>
</pre></div>
</td>
</tr>
<tr>
<td class="docs">
<p><code>Parse</code> will return an error on malformed input
explaining the parsing problem.</p>
</td>
<td class="code">
<div class="highlight"><pre> <span class="nx">ansic</span> <span class="o">:=</span> <span class="s">&quot;Mon Jan _2 15:04:05 2006&quot;</span>
<span class="nx">_</span><span class="p">,</span> <span class="nx">e</span> <span class="p">=</span> <span class="nx">time</span><span class="p">.</span><span class="nx">Parse</span><span class="p">(</span><span class="nx">ansic</span><span class="p">,</span> <span class="s">&quot;8:41PM&quot;</span><span class="p">)</span>
<span class="nx">p</span><span class="p">(</span><span class="nx">e</span><span class="p">)</span>
<span class="p">}</span>
</pre></div>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code">
<div class="highlight"><pre><span class="gp">$</span> go run time-formatting-parsing.go
<span class="go">2014-04-15T18:00:15-07:00</span>
<span class="go">2012-11-01 22:08:41 +0000 +0000</span>
<span class="go">6:00PM</span>
<span class="go">Tue Apr 15 18:00:15 2014</span>
<span class="go">2014-04-15T18:00:15.161182-07:00</span>
<span class="go">0000-01-01 20:41:00 +0000 UTC</span>
<span class="go">2014-04-15T18:00:15-00:00</span>
<span class="go">parsing time &quot;8:41PM&quot; as &quot;Mon Jan _2 15:04:05 2006&quot;: ...</span>
</pre></div>
</td>
</tr>
</table>
<p class="next">
Next example: <a href="random-numbers">Random Numbers</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-formatting-parsing">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
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