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<a name="boost.date_time.us_dst_trait"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct template us_dst_trait</span></h2>
<p>boost::date_time::us_dst_trait &#8212; Specification for daylight savings start rules in US. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../date_time/doxy.html#header.boost.date_time.local_timezone_defs_hpp" title="Header &lt;boost/date_time/local_timezone_defs.hpp&gt;">boost/date_time/local_timezone_defs.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> date_type<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="us_dst_trait.html" title="Struct template us_dst_trait">us_dst_trait</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">date_type</span><span class="special">::</span><span class="identifier">day_of_week_type</span>                 <a name="boost.date_time.us_dst_trait.day_of_week_type"></a><span class="identifier">day_of_week_type</span><span class="special">;</span>          
  <span class="keyword">typedef</span> <span class="identifier">date_type</span><span class="special">::</span><span class="identifier">month_type</span>                       <a name="boost.date_time.us_dst_trait.month_type"></a><span class="identifier">month_type</span><span class="special">;</span>                
  <span class="keyword">typedef</span> <span class="identifier">date_type</span><span class="special">::</span><span class="identifier">year_type</span>                        <a name="boost.date_time.us_dst_trait.year_type"></a><span class="identifier">year_type</span><span class="special">;</span>                 
  <span class="keyword">typedef</span> <a class="link" href="nth_kday_of_month.html" title="Class template nth_kday_of_month">date_time::nth_kday_of_month</a><span class="special">&lt;</span> <span class="identifier">date_type</span> <span class="special">&gt;</span>   <a name="boost.date_time.us_dst_trait.start_rule_functor"></a><span class="identifier">start_rule_functor</span><span class="special">;</span>        
  <span class="keyword">typedef</span> <a class="link" href="first_kday_of_month.html" title="Class template first_kday_of_month">date_time::first_kday_of_month</a><span class="special">&lt;</span> <span class="identifier">date_type</span> <span class="special">&gt;</span> <a name="boost.date_time.us_dst_trait.end_rule_functor"></a><span class="identifier">end_rule_functor</span><span class="special">;</span>          
  <span class="keyword">typedef</span> <a class="link" href="first_kday_of_month.html" title="Class template first_kday_of_month">date_time::first_kday_of_month</a><span class="special">&lt;</span> <span class="identifier">date_type</span> <span class="special">&gt;</span> <a name="boost.date_time.us_dst_trait.start_rule_functor_pre2007"></a><span class="identifier">start_rule_functor_pre2007</span><span class="special">;</span>
  <span class="keyword">typedef</span> <a class="link" href="last_kday_of_month.html" title="Class template last_kday_of_month">date_time::last_kday_of_month</a><span class="special">&lt;</span> <span class="identifier">date_type</span> <span class="special">&gt;</span>  <a name="boost.date_time.us_dst_trait.end_rule_functor_pre2007"></a><span class="identifier">end_rule_functor_pre2007</span><span class="special">;</span>  

  <span class="comment">// <a class="link" href="us_dst_trait.html#idm45507105171168-bb">public static functions</a></span>
  <span class="keyword">static</span> <span class="identifier">day_of_week_type</span> <a class="link" href="us_dst_trait.html#idm45507108877968-bb"><span class="identifier">start_day</span></a><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">month_type</span> <a class="link" href="us_dst_trait.html#idm45507108876160-bb"><span class="identifier">start_month</span></a><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">day_of_week_type</span> <a class="link" href="us_dst_trait.html#idm45507160270944-bb"><span class="identifier">end_day</span></a><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">month_type</span> <a class="link" href="us_dst_trait.html#idm45507137700048-bb"><span class="identifier">end_month</span></a><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">date_type</span> <a class="link" href="us_dst_trait.html#idm45507157070336-bb"><span class="identifier">local_dst_start_day</span></a><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">date_type</span> <a class="link" href="us_dst_trait.html#idm45507157068528-bb"><span class="identifier">local_dst_end_day</span></a><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="keyword">int</span> <a class="link" href="us_dst_trait.html#idm45507135377152-bb"><span class="identifier">dst_start_offset_minutes</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="keyword">int</span> <a class="link" href="us_dst_trait.html#idm45507135376064-bb"><span class="identifier">dst_end_offset_minutes</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">static</span> <span class="keyword">int</span> <a class="link" href="us_dst_trait.html#idm45507156250192-bb"><span class="identifier">dst_shift_length_minutes</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idm45555367643552"></a><h2>Description</h2>
<p>This class is used to configure <a class="link" href="dst_calc_engine.html" title="Class template dst_calc_engine">dst_calc_engine</a> template typically as follows: </p>
<pre class="programlisting"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span>
<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">us_dst_trait</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">us_dst_traits</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">date_time</span><span class="special">::</span><span class="identifier">dst_calc_engine</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">,</span> <span class="identifier">time_duration</span><span class="special">,</span> 
                                          <span class="identifier">us_dst_traits</span><span class="special">&gt;</span>  
                                          <span class="identifier">us_dst_calc</span><span class="special">;</span>
<span class="comment">//calculate the 2002 transition day of USA April 7 2002</span>
<span class="identifier">date</span> <span class="identifier">dst_start</span> <span class="special">=</span> <span class="identifier">us_dst_calc</span><span class="special">::</span><span class="identifier">local_dst_start_day</span><span class="special">(</span><span class="number">2002</span><span class="special">)</span><span class="special">;</span> 

<span class="comment">//calculate the 2002 transition day of USA Oct 27 2002</span>
<span class="identifier">date</span> <span class="identifier">dst_end</span> <span class="special">=</span> <span class="identifier">us_dst_calc</span><span class="special">::</span><span class="identifier">local_dst_end_day</span><span class="special">(</span><span class="number">2002</span><span class="special">)</span><span class="special">;</span> 
                                          
<span class="comment">//check if a local time is in dst or not -- posible answers</span>
<span class="comment">//are yes, no, invalid time label, ambiguous</span>
<span class="identifier">ptime</span> <span class="identifier">t</span><span class="special">(</span><span class="special">...</span><span class="identifier">some</span> <span class="identifier">time</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>  
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">us_dst</span><span class="special">::</span><span class="identifier">local_is_dst</span><span class="special">(</span><span class="identifier">t</span><span class="special">.</span><span class="identifier">date</span><span class="special">(</span><span class="special">)</span><span class="special">,</span> <span class="identifier">t</span><span class="special">.</span><span class="identifier">time_of_day</span><span class="special">(</span><span class="special">)</span><span class="special">)</span> 
    <span class="special">==</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">date_time</span><span class="special">::</span><span class="identifier">is_not_in_dst</span><span class="special">)</span> 
<span class="special">{</span>

<span class="special">}</span>
</pre>
<p> This generates a type suitable for the calculation of dst transitions for the United States. Of course other templates can be used for other locales. </p>
<div class="refsect2">
<a name="idm45555367585152"></a><h3>
<a name="idm45507105171168-bb"></a><code class="computeroutput">us_dst_trait</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">day_of_week_type</span> <a name="idm45507108877968-bb"></a><span class="identifier">start_day</span><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">month_type</span> <a name="idm45507108876160-bb"></a><span class="identifier">start_month</span><span class="special">(</span><span class="identifier">year_type</span> y<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">day_of_week_type</span> <a name="idm45507160270944-bb"></a><span class="identifier">end_day</span><span class="special">(</span><span class="identifier">year_type</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">month_type</span> <a name="idm45507137700048-bb"></a><span class="identifier">end_month</span><span class="special">(</span><span class="identifier">year_type</span> y<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">date_type</span> <a name="idm45507157070336-bb"></a><span class="identifier">local_dst_start_day</span><span class="special">(</span><span class="identifier">year_type</span> year<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">date_type</span> <a name="idm45507157068528-bb"></a><span class="identifier">local_dst_end_day</span><span class="special">(</span><span class="identifier">year_type</span> year<span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">int</span> <a name="idm45507135377152-bb"></a><span class="identifier">dst_start_offset_minutes</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">int</span> <a name="idm45507135376064-bb"></a><span class="identifier">dst_end_offset_minutes</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">int</span> <a name="idm45507156250192-bb"></a><span class="identifier">dst_shift_length_minutes</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
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