+ Penlight

author: chai <chaifix@163.com> 2021-10-30 11:32:16 +0800
committer: chai <chaifix@163.com> 2021-10-30 11:32:16 +0800
commit: 42ec7286b2d36a9ba22925f816a17cb1cc2aa5ce (patch)
tree: 24bc7009457a8d7500f264e89946dc20d069294f /Data/Libraries/Penlight/docs/manual/05-dates.md.html
parent: 164885fd98d48703bd771f802d79557b7db97431 (diff)
1 files changed, 269 insertions, 0 deletions
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+++ b/Data/Libraries/Penlight/docs/manual/05-dates.md.html
@@ -0,0 +1,269 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
+<head>
+    <title>Penlight Documentation</title>
+    <link rel="stylesheet" href="../ldoc_fixed.css" type="text/css" />
+</head>
+<body>
+
+<div id="container">
+
+<div id="product">
+	<div id="product_logo"></div>
+	<div id="product_name"><big><b></b></big></div>
+	<div id="product_description"></div>
+</div> <!-- id="product" -->
+
+
+<div id="main">
+
+
+<!-- Menu -->
+
+<div id="navigation">
+<br/>
+<h1>Penlight</h1>
+
+<ul>
+  <li><a href="https://github.com/lunarmodules/Penlight">GitHub Project</a></li>
+  <li><a href="../index.html">Documentation</a></li>
+</ul>
+
+<h2>Contents</h2>
+<ul>
+<li><a href="#Creating_and_Displaying_Dates">Creating and Displaying Dates </a></li>
+</ul>
+
+
+<h2>Manual</h2>
+<ul class="nowrap">
+  <li><a href="../manual/01-introduction.md.html">Introduction</a></li>
+  <li><a href="../manual/02-arrays.md.html">Tables and Arrays</a></li>
+  <li><a href="../manual/03-strings.md.html">Strings. Higher-level operations on strings.</a></li>
+  <li><a href="../manual/04-paths.md.html">Paths and Directories</a></li>
+  <li><strong>Date and Time</strong></li>
+  <li><a href="../manual/06-data.md.html">Data</a></li>
+  <li><a href="../manual/07-functional.md.html">Functional Programming</a></li>
+  <li><a href="../manual/08-additional.md.html">Additional Libraries</a></li>
+  <li><a href="../manual/09-discussion.md.html">Technical Choices</a></li>
+</ul>
+<h2>Libraries</h2>
+<ul class="nowrap">
+  <li><a href="../libraries/pl.html">pl</a></li>
+  <li><a href="../libraries/pl.app.html">pl.app</a></li>
+  <li><a href="../libraries/pl.array2d.html">pl.array2d</a></li>
+  <li><a href="../libraries/pl.class.html">pl.class</a></li>
+  <li><a href="../libraries/pl.compat.html">pl.compat</a></li>
+  <li><a href="../libraries/pl.comprehension.html">pl.comprehension</a></li>
+  <li><a href="../libraries/pl.config.html">pl.config</a></li>
+  <li><a href="../libraries/pl.data.html">pl.data</a></li>
+  <li><a href="../libraries/pl.dir.html">pl.dir</a></li>
+  <li><a href="../libraries/pl.file.html">pl.file</a></li>
+  <li><a href="../libraries/pl.func.html">pl.func</a></li>
+  <li><a href="../libraries/pl.import_into.html">pl.import_into</a></li>
+  <li><a href="../libraries/pl.input.html">pl.input</a></li>
+  <li><a href="../libraries/pl.lapp.html">pl.lapp</a></li>
+  <li><a href="../libraries/pl.lexer.html">pl.lexer</a></li>
+  <li><a href="../libraries/pl.luabalanced.html">pl.luabalanced</a></li>
+  <li><a href="../libraries/pl.operator.html">pl.operator</a></li>
+  <li><a href="../libraries/pl.path.html">pl.path</a></li>
+  <li><a href="../libraries/pl.permute.html">pl.permute</a></li>
+  <li><a href="../libraries/pl.pretty.html">pl.pretty</a></li>
+  <li><a href="../libraries/pl.seq.html">pl.seq</a></li>
+  <li><a href="../libraries/pl.sip.html">pl.sip</a></li>
+  <li><a href="../libraries/pl.strict.html">pl.strict</a></li>
+  <li><a href="../libraries/pl.stringio.html">pl.stringio</a></li>
+  <li><a href="../libraries/pl.stringx.html">pl.stringx</a></li>
+  <li><a href="../libraries/pl.tablex.html">pl.tablex</a></li>
+  <li><a href="../libraries/pl.template.html">pl.template</a></li>
+  <li><a href="../libraries/pl.test.html">pl.test</a></li>
+  <li><a href="../libraries/pl.text.html">pl.text</a></li>
+  <li><a href="../libraries/pl.types.html">pl.types</a></li>
+  <li><a href="../libraries/pl.url.html">pl.url</a></li>
+  <li><a href="../libraries/pl.utils.html">pl.utils</a></li>
+  <li><a href="../libraries/pl.xml.html">pl.xml</a></li>
+</ul>
+<h2>Classes</h2>
+<ul class="nowrap">
+  <li><a href="../classes/pl.Date.html">pl.Date</a></li>
+  <li><a href="../classes/pl.List.html">pl.List</a></li>
+  <li><a href="../classes/pl.Map.html">pl.Map</a></li>
+  <li><a href="../classes/pl.MultiMap.html">pl.MultiMap</a></li>
+  <li><a href="../classes/pl.OrderedMap.html">pl.OrderedMap</a></li>
+  <li><a href="../classes/pl.Set.html">pl.Set</a></li>
+</ul>
+<h2>Examples</h2>
+<ul class="nowrap">
+  <li><a href="../examples/seesubst.lua.html">seesubst.lua</a></li>
+  <li><a href="../examples/sipscan.lua.html">sipscan.lua</a></li>
+  <li><a href="../examples/symbols.lua.html">symbols.lua</a></li>
+  <li><a href="../examples/test-cmp.lua.html">test-cmp.lua</a></li>
+  <li><a href="../examples/test-data.lua.html">test-data.lua</a></li>
+  <li><a href="../examples/test-listcallbacks.lua.html">test-listcallbacks.lua</a></li>
+  <li><a href="../examples/test-pretty.lua.html">test-pretty.lua</a></li>
+  <li><a href="../examples/test-symbols.lua.html">test-symbols.lua</a></li>
+  <li><a href="../examples/testclone.lua.html">testclone.lua</a></li>
+  <li><a href="../examples/testconfig.lua.html">testconfig.lua</a></li>
+  <li><a href="../examples/testglobal.lua.html">testglobal.lua</a></li>
+  <li><a href="../examples/testinputfields.lua.html">testinputfields.lua</a></li>
+  <li><a href="../examples/testinputfields2.lua.html">testinputfields2.lua</a></li>
+  <li><a href="../examples/testxml.lua.html">testxml.lua</a></li>
+  <li><a href="../examples/which.lua.html">which.lua</a></li>
+</ul>
+
+</div>
+
+<div id="content">
+
+
+<h2>Date and Time</h2>
+
+<p><a id="date"></a></p>
+
+<p>NOTE: the Date module is deprecated</p>
+
+<p><a name="Creating_and_Displaying_Dates"></a></p>
+<h3>Creating and Displaying Dates</h3>
+
+<p>The <a href="../classes/pl.Date.html#">Date</a> class provides a simplified way to work with <a href="http://www.lua.org/pil/22.1.html">date and
+time</a> in Lua; it leans heavily on the functions
+<a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.date">os.date</a> and <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a>.</p>
+
+<p>A <a href="../classes/pl.Date.html#">Date</a> object can be constructed from a table, just like with <a href="https://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a>.
+Methods are provided to get and set the various parts of the date.</p>
+
+
+<pre>
+&gt; d = Date {year = <span class="number">2011</span>, month = <span class="number">3</span>, day = <span class="number">2</span> }
+&gt; = d
+<span class="number">2011</span>-<span class="number">03</span>-<span class="number">02</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = d:month(),d:year(),d:day()
+<span class="number">3</span>    <span class="number">2011</span>    <span class="number">2</span>
+&gt; d:month(<span class="number">4</span>)
+&gt; = d
+<span class="number">2011</span>-<span class="number">04</span>-<span class="number">02</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; d:add {day=<span class="number">1</span>}
+&gt; = d
+<span class="number">2011</span>-<span class="number">04</span>-<span class="number">03</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+</pre>
+
+<p><code>add</code> takes a table containing one of the date table fields.</p>
+
+
+<pre>
+&gt; = d:weekday_name()
+Sun
+&gt; = d:last_day()
+<span class="number">2011</span>-<span class="number">04</span>-<span class="number">30</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = d:month_name(<span class="keyword">true</span>)
+April
+</pre>
+
+<p>There is a default conversion to text for date objects, but <a href="../classes/pl.Date.html#Date.Format">Date.Format</a> gives
+you full control of the format for both parsing and displaying dates:</p>
+
+
+<pre>
+&gt; iso = Date.Format <span class="string">'yyyy-mm-dd'</span>
+&gt; d = iso:parse <span class="string">'2010-04-10'</span>
+&gt; amer = Date.Format <span class="string">'mm/dd/yyyy'</span>
+&gt; = amer:<span class="global">tostring</span>(d)
+<span class="number">04</span>/<span class="number">10</span>/<span class="number">2010</span>
+</pre>
+
+<p>With the 0.9.7 relase, the <a href="../classes/pl.Date.html#">Date</a> constructor has become more flexible. You may
+omit any of the 'year', 'month' or 'day' fields:</p>
+
+
+<pre>
+&gt; = Date { year = <span class="number">2008</span> }
+<span class="number">2008</span>-<span class="number">01</span>-<span class="number">01</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = Date { month = <span class="number">3</span> }
+<span class="number">2011</span>-<span class="number">03</span>-<span class="number">01</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = Date { day = <span class="number">20</span> }
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">20</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = Date { hour = <span class="number">14</span>, min = <span class="number">30</span> }
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">13</span> <span class="number">14</span>:<span class="number">30</span>:<span class="number">00</span>
+</pre>
+
+<p>If 'year' is omitted, then the current year is assumed, and likewise for 'month'.</p>
+
+<p>To set the time on such a partial date, you can use the fact that the 'setter'
+methods return the date object and so you can 'chain' these methods.</p>
+
+
+<pre>
+&gt; d = Date { day = <span class="number">03</span> }
+&gt; = d:hour(<span class="number">18</span>):min(<span class="number">30</span>)
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">03</span> <span class="number">18</span>:<span class="number">30</span>:<span class="number">00</span>
+</pre>
+
+<p>Finally, <a href="../classes/pl.Date.html#">Date</a> also now accepts positional arguments:</p>
+
+
+<pre>
+&gt; = Date(<span class="number">2011</span>,<span class="number">10</span>,<span class="number">3</span>)
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">03</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = Date(<span class="number">2011</span>,<span class="number">10</span>,<span class="number">3</span>,<span class="number">18</span>,<span class="number">30</span>,<span class="number">23</span>)
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">03</span> <span class="number">18</span>:<span class="number">30</span>:<span class="number">23</span>
+</pre>
+
+<p><code>Date.format</code> has been extended. If you construct an instance without a pattern,
+then it will try to match against a set of known formats. This is useful for
+human-input dates since keeping to a strict format is not one of the strong
+points of users. It assumes that there will be a date, and then a date.</p>
+
+
+<pre>
+&gt; df = Date.Format()
+&gt; = df:parse <span class="string">'5.30pm'</span>
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">13</span> <span class="number">17</span>:<span class="number">30</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'1730'</span>
+<span class="keyword">nil</span>     day out of range: <span class="number">1730</span> is <span class="keyword">not</span> between <span class="number">1</span> <span class="keyword">and</span> <span class="number">31</span>
+&gt; = df:parse <span class="string">'17.30'</span>
+<span class="number">2011</span>-<span class="number">10</span>-<span class="number">13</span> <span class="number">17</span>:<span class="number">30</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'mar'</span>
+<span class="number">2011</span>-<span class="number">03</span>-<span class="number">01</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'3 March'</span>
+<span class="number">2011</span>-<span class="number">03</span>-<span class="number">03</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'15 March'</span>
+<span class="number">2011</span>-<span class="number">03</span>-<span class="number">15</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'15 March 2008'</span>
+<span class="number">2008</span>-<span class="number">03</span>-<span class="number">15</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'15 March 2008 1.30pm'</span>
+<span class="number">2008</span>-<span class="number">03</span>-<span class="number">15</span> <span class="number">13</span>:<span class="number">30</span>:<span class="number">00</span>
+&gt; = df:parse <span class="string">'2008-10-03 15:30:23'</span>
+<span class="number">2008</span>-<span class="number">10</span>-<span class="number">03</span> <span class="number">15</span>:<span class="number">30</span>:<span class="number">23</span>
+</pre>
+
+<p>ISO date format is of course a good idea if you need to deal with users from
+different countries. Here is the default behaviour for 'short' dates:</p>
+
+
+<pre>
+&gt; = df:parse <span class="string">'24/02/12'</span>
+<span class="number">2012</span>-<span class="number">02</span>-<span class="number">24</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+</pre>
+
+<p>That's not what Americans expect! It's tricky to work out in a cross-platform way
+exactly what the expected format is, so there is an explicit flag:</p>
+
+
+<pre>
+&gt; df:US_order(<span class="keyword">true</span>)
+&gt; = df:parse <span class="string">'9/11/01'</span>
+<span class="number">2001</span>-<span class="number">11</span>-<span class="number">09</span> <span class="number">12</span>:<span class="number">00</span>:<span class="number">00</span>
+</pre>
+
+
+
+</div> <!-- id="content" -->
+</div> <!-- id="main" -->
+<div id="about">
+<i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.6</a></i>
+</div> <!-- id="about" -->
+</div> <!-- id="container" -->
+</body>
+</html>
author	chai <chaifix@163.com>	2021-10-30 11:32:16 +0800
committer	chai <chaifix@163.com>	2021-10-30 11:32:16 +0800
commit	42ec7286b2d36a9ba22925f816a17cb1cc2aa5ce (patch)
tree	24bc7009457a8d7500f264e89946dc20d069294f /Data/Libraries/Penlight/docs/manual/05-dates.md.html
parent	164885fd98d48703bd771f802d79557b7db97431 (diff)