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<li><a href="../modules/pl.html">pl</a></li>
<li><strong>pl.Date</strong></li>
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<li><a href="../topics/05-dates.md.html">05-dates.md</a></li>
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<div id="content">
<h1>Module <code>pl.Date</code></h1>
<p>Date and Date Format classes.</p>
<p> See <a href="../topics/05-dates.md.html#">the Guide</a>.</p>
<p> Dependencies: <a href="../modules/pl.class.html#">pl.class</a> , <a href="../modules/pl.stringx.html#">pl.stringx</a> </p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#Date">Date&nbsp;(t)</a></td>
<td class="summary">Date constructor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date.tzone">Date.tzone&nbsp;()</a></td>
<td class="summary">get the time zone offset from UTC.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:toUTC">Date:toUTC&nbsp;()</a></td>
<td class="summary">convert this date to UTC.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:toLocal">Date:toLocal&nbsp;()</a></td>
<td class="summary">convert this UTC date to local.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:set">Date:set&nbsp;(t)</a></td>
<td class="summary">set the current time of this Date object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:year">Date:year&nbsp;(y)</a></td>
<td class="summary">set the year.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:month">Date:month&nbsp;(m)</a></td>
<td class="summary">set the month.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:day">Date:day&nbsp;(d)</a></td>
<td class="summary">set the day.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:hour">Date:hour&nbsp;(h)</a></td>
<td class="summary">set the hour.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:min">Date:min&nbsp;(min)</a></td>
<td class="summary">set the minutes.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:sec">Date:sec&nbsp;(sec)</a></td>
<td class="summary">set the seconds.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:yday">Date:yday&nbsp;(yday)</a></td>
<td class="summary">set the day of year.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:year">Date:year&nbsp;(y)</a></td>
<td class="summary">get the year.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:month">Date:month&nbsp;()</a></td>
<td class="summary">get the month.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:day">Date:day&nbsp;()</a></td>
<td class="summary">get the day.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:hour">Date:hour&nbsp;()</a></td>
<td class="summary">get the hour.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:min">Date:min&nbsp;()</a></td>
<td class="summary">get the minutes.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:sec">Date:sec&nbsp;()</a></td>
<td class="summary">get the seconds.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:yday">Date:yday&nbsp;()</a></td>
<td class="summary">get the day of year.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:weekday_name">Date:weekday_name&nbsp;(full)</a></td>
<td class="summary">name of day of week.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:month_name">Date:month_name&nbsp;(full)</a></td>
<td class="summary">name of month.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:is_weekend">Date:is_weekend&nbsp;()</a></td>
<td class="summary">is this day on a weekend?.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:add">Date:add&nbsp;(t)</a></td>
<td class="summary">add to a date object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:last_day">Date:last_day&nbsp;()</a></td>
<td class="summary">last day of the month.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:diff">Date:diff&nbsp;(other)</a></td>
<td class="summary">difference between two Date objects.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:__tostring">Date:__tostring&nbsp;()</a></td>
<td class="summary">long numerical ISO data format version of this date.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:__eq">Date:__eq&nbsp;()</a></td>
<td class="summary">equality between Date objects.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date:__lt">Date:__lt&nbsp;()</a></td>
<td class="summary">equality between Date objects.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date.Format">Date.Format&nbsp;(fmt.)</a></td>
<td class="summary">Date.Format constructor.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date.Format:parse">Date.Format:parse&nbsp;(str)</a></td>
<td class="summary">parse a string into a Date object.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#Date.Format:tostring">Date.Format:tostring&nbsp;(d)</a></td>
<td class="summary">convert a Date object into a string.</td>
</tr>
</table>
<br/>
<br/>
<h2><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "Date"></a>
<strong>Date&nbsp;(t)</strong>
</dt>
<dd>
Date constructor.
<h3>Parameters:</h3>
<ul>
<li><code><em>t</em></code>: this can be either <ul>
<li>nil &ndash; use current date and time</li>
<li>number &ndash; seconds since epoch (as returned by <a href="http://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a>)</li>
<li>Date &ndash; copy constructor</li>
<li>table &ndash; table containing year, month, etc as for os.time()
You may leave out year, month or day, in which case current values will be used.
</li>
<li> two to six numbers: year, month, day, hour, min, sec
</ul></li>
</ul>
</dd>
<dt>
<a name = "Date.tzone"></a>
<strong>Date.tzone&nbsp;()</strong>
</dt>
<dd>
get the time zone offset from UTC.
<h3>Returns:</h3>
<ol>
<li>hours ahead of UTC</li>
<li>minutes ahead of UTC</li>
</ol>
</dd>
<dt>
<a name = "Date:toUTC"></a>
<strong>Date:toUTC&nbsp;()</strong>
</dt>
<dd>
convert this date to UTC.
</dd>
<dt>
<a name = "Date:toLocal"></a>
<strong>Date:toLocal&nbsp;()</strong>
</dt>
<dd>
convert this UTC date to local.
</dd>
<dt>
<a name = "Date:set"></a>
<strong>Date:set&nbsp;(t)</strong>
</dt>
<dd>
set the current time of this Date object.
<h3>Parameters:</h3>
<ul>
<li><code><em>t</em></code>: seconds since epoch</li>
</ul>
</dd>
<dt>
<a name = "Date:year"></a>
<strong>Date:year&nbsp;(y)</strong>
</dt>
<dd>
set the year.
<h3>Parameters:</h3>
<ul>
<li><code><em>y</em></code>: Four-digit year</li>
</ul>
</dd>
<dt>
<a name = "Date:month"></a>
<strong>Date:month&nbsp;(m)</strong>
</dt>
<dd>
set the month.
<h3>Parameters:</h3>
<ul>
<li><code><em>m</em></code>: month</li>
</ul>
</dd>
<dt>
<a name = "Date:day"></a>
<strong>Date:day&nbsp;(d)</strong>
</dt>
<dd>
set the day.
<h3>Parameters:</h3>
<ul>
<li><code><em>d</em></code>: day</li>
</ul>
</dd>
<dt>
<a name = "Date:hour"></a>
<strong>Date:hour&nbsp;(h)</strong>
</dt>
<dd>
set the hour.
<h3>Parameters:</h3>
<ul>
<li><code><em>h</em></code>: hour</li>
</ul>
</dd>
<dt>
<a name = "Date:min"></a>
<strong>Date:min&nbsp;(min)</strong>
</dt>
<dd>
set the minutes.
<h3>Parameters:</h3>
<ul>
<li><code><em>min</em></code>: minutes</li>
</ul>
</dd>
<dt>
<a name = "Date:sec"></a>
<strong>Date:sec&nbsp;(sec)</strong>
</dt>
<dd>
set the seconds.
<h3>Parameters:</h3>
<ul>
<li><code><em>sec</em></code>: seconds</li>
</ul>
</dd>
<dt>
<a name = "Date:yday"></a>
<strong>Date:yday&nbsp;(yday)</strong>
</dt>
<dd>
set the day of year.
<h3>Parameters:</h3>
<ul>
<li><code><em>yday</em></code>: day of year</li>
</ul>
</dd>
<dt>
<a name = "Date:year"></a>
<strong>Date:year&nbsp;(y)</strong>
</dt>
<dd>
get the year.
<h3>Parameters:</h3>
<ul>
<li><code><em>y</em></code>: Four-digit year</li>
</ul>
</dd>
<dt>
<a name = "Date:month"></a>
<strong>Date:month&nbsp;()</strong>
</dt>
<dd>
get the month.
</dd>
<dt>
<a name = "Date:day"></a>
<strong>Date:day&nbsp;()</strong>
</dt>
<dd>
get the day.
</dd>
<dt>
<a name = "Date:hour"></a>
<strong>Date:hour&nbsp;()</strong>
</dt>
<dd>
get the hour.
</dd>
<dt>
<a name = "Date:min"></a>
<strong>Date:min&nbsp;()</strong>
</dt>
<dd>
get the minutes.
</dd>
<dt>
<a name = "Date:sec"></a>
<strong>Date:sec&nbsp;()</strong>
</dt>
<dd>
get the seconds.
</dd>
<dt>
<a name = "Date:yday"></a>
<strong>Date:yday&nbsp;()</strong>
</dt>
<dd>
get the day of year.
</dd>
<dt>
<a name = "Date:weekday_name"></a>
<strong>Date:weekday_name&nbsp;(full)</strong>
</dt>
<dd>
name of day of week.
<h3>Parameters:</h3>
<ul>
<li><code><em>full</em></code>: abbreviated if true, full otherwise.</li>
</ul>
<h3>Returns:</h3>
<ol>
string name
</ol>
</dd>
<dt>
<a name = "Date:month_name"></a>
<strong>Date:month_name&nbsp;(full)</strong>
</dt>
<dd>
name of month.
<h3>Parameters:</h3>
<ul>
<li><code><em>full</em></code>: abbreviated if true, full otherwise.</li>
</ul>
<h3>Returns:</h3>
<ol>
string name
</ol>
</dd>
<dt>
<a name = "Date:is_weekend"></a>
<strong>Date:is_weekend&nbsp;()</strong>
</dt>
<dd>
is this day on a weekend?.
</dd>
<dt>
<a name = "Date:add"></a>
<strong>Date:add&nbsp;(t)</strong>
</dt>
<dd>
add to a date object.
<h3>Parameters:</h3>
<ul>
<li><code><em>t</em></code>: a table containing one of the following keys and a value:<br>
year,month,day,hour,min,sec</li>
</ul>
<h3>Returns:</h3>
<ol>
this date
</ol>
</dd>
<dt>
<a name = "Date:last_day"></a>
<strong>Date:last_day&nbsp;()</strong>
</dt>
<dd>
last day of the month.
<h3>Returns:</h3>
<ol>
int day
</ol>
</dd>
<dt>
<a name = "Date:diff"></a>
<strong>Date:diff&nbsp;(other)</strong>
</dt>
<dd>
difference between two Date objects.
Note: currently the result is a regular <a href="../modules/pl.Date.html#pl.Date">?que</a> object,
but also has <code>interval</code> field set, which means a more
appropriate string rep is used.
<h3>Parameters:</h3>
<ul>
<li><code><em>other</em></code>: Date object</li>
</ul>
<h3>Returns:</h3>
<ol>
a Date object
</ol>
</dd>
<dt>
<a name = "Date:__tostring"></a>
<strong>Date:__tostring&nbsp;()</strong>
</dt>
<dd>
long numerical ISO data format version of this date.
</dd>
<dt>
<a name = "Date:__eq"></a>
<strong>Date:__eq&nbsp;()</strong>
</dt>
<dd>
equality between Date objects.
</dd>
<dt>
<a name = "Date:__lt"></a>
<strong>Date:__lt&nbsp;()</strong>
</dt>
<dd>
equality between Date objects.
</dd>
<dt>
<a name = "Date.Format"></a>
<strong>Date.Format&nbsp;(fmt.)</strong>
</dt>
<dd>
Date.Format constructor.
<h3>Parameters:</h3>
<ul>
<li><code><em>fmt.</em></code>: A string where the following fields are significant: <ul>
<li>d day (either d or dd)</li>
<li>y year (either yy or yyy)</li>
<li>m month (either m or mm)</li>
<li>H hour (either H or HH)</li>
<li>M minute (either M or MM)</li>
<li>S second (either S or SS)</li>
</ul>
Alternatively, if fmt is nil then this returns a flexible date parser
that tries various date/time schemes in turn:
<ol>
<li> <a href="http://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a>,</p>
<pre><code>like 2010-05-10 12:35:23Z or 2008-10-03T14:30+02&lt;li&gt;
</code></pre>
<p> <li> times like 15:30 or 8.05pm (assumed to be today&rsquo;s date)</li>
<li> dates like 28/10/02 (European order!) or 5 Feb 2012 </li>
<li> month name like march or Mar (case-insensitive, first 3 letters);
here the day will be 1 and the year this current year </li>
</ol>
A date in format 3 can be optionally followed by a time in format 2.
Please see test-date.lua in the tests folder for more examples.</li>
</ul>
<h3>Usage:</h3>
<ul>
<pre class="example">df = Date.Format("yyyy-mm-dd HH:MM:SS")</pre>
</ul>
</dd>
<dt>
<a name = "Date.Format:parse"></a>
<strong>Date.Format:parse&nbsp;(str)</strong>
</dt>
<dd>
parse a string into a Date object.
<h3>Parameters:</h3>
<ul>
<li><code><em>str</em></code>: a date string</li>
</ul>
<h3>Returns:</h3>
<ol>
date object
</ol>
</dd>
<dt>
<a name = "Date.Format:tostring"></a>
<strong>Date.Format:tostring&nbsp;(d)</strong>
</dt>
<dd>
convert a Date object into a string.
<h3>Parameters:</h3>
<ul>
<li><code><em>d</em></code>: a date object, or a time value as returned by <a href="http://www.lua.org/manual/5.1/manual.html#pdf-os.time">os.time</a></li>
</ul>
<h3>Returns:</h3>
<ol>
string
</ol>
</dd>
</dl>
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