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  26 <a name="boost.date_time.null_dst_rules"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class template null_dst_rules</span></h2>
  29 <p>boost::date_time::null_dst_rules &#8212; Used for local time adjustments in places that don't use dst. </p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <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.dst_rules_hpp" title="Header &lt;boost/date_time/dst_rules.hpp&gt;">boost/date_time/dst_rules.hpp</a>&gt;
  33
  34 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> date_type_<span class="special">,</span> <span class="keyword">typename</span> time_duration_type_<span class="special">&gt;</span>
  35 <span class="keyword">class</span> <a class="link" href="null_dst_rules.html" title="Class template null_dst_rules">null_dst_rules</a> <span class="special">{</span>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// types</span>
  38   <span class="keyword">typedef</span> <span class="identifier">time_duration_type_</span> <a name="boost.date_time.null_dst_rules.time_duration_type"></a><span class="identifier">time_duration_type</span><span class="special">;</span>
  39   <span class="keyword">typedef</span> <span class="identifier">date_type_</span>          <a name="boost.date_time.null_dst_rules.date_type"></a><span class="identifier">date_type</span><span class="special">;</span>
  40
  41   <span class="comment">// <a class="link" href="null_dst_rules.html#idp50320608-bb">public static functions</a></span>
  42   <span class="keyword">static</span> <span class="identifier">time_is_dst_result</span>
  43   <a class="link" href="null_dst_rules.html#idp50321168-bb"><span class="identifier">local_is_dst</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">date_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">time_duration_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  44   <span class="keyword">static</span> <span class="identifier">time_is_dst_result</span>
  45   <a class="link" href="null_dst_rules.html#idp72772880-bb"><span class="identifier">utc_is_dst</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">date_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">time_duration_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  46   <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="null_dst_rules.html#idp40800480-bb"><span class="identifier">is_dst_boundary_day</span></a><span class="special">(</span><span class="identifier">date_type</span><span class="special">)</span><span class="special">;</span>
  47   <span class="keyword">static</span> <span class="identifier">time_duration_type</span> <a class="link" href="null_dst_rules.html#idp95701280-bb"><span class="identifier">dst_offset</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  48 <span class="special">}</span><span class="special">;</span></pre></div>
  49 <div class="refsect1">
  50 <a name="idp189692688"></a><h2>Description</h2>
  51 <div class="refsect2">
  52 <a name="idp189693104"></a><h3>
  53 <a name="idp50320608-bb"></a><code class="computeroutput">null_dst_rules</code> public static functions</h3>
  54 <div class="orderedlist"><ol class="orderedlist" type="1">
  55 <li class="listitem">
  56 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">time_is_dst_result</span>
  57 <a name="idp50321168-bb"></a><span class="identifier">local_is_dst</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">date_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">time_duration_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span></pre>Calculates if the given local time is dst or not. <p>
  58 </p>
  59 </li>
  60 <li class="listitem">
  61 <pre class="literallayout"><span class="keyword">static</span> <span class="identifier">time_is_dst_result</span>
  62 <a name="idp72772880-bb"></a><span class="identifier">utc_is_dst</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">date_type</span> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">time_duration_type</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span></pre>Calculates if the given utc time is in dst. </li>
  63 <li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp40800480-bb"></a><span class="identifier">is_dst_boundary_day</span><span class="special">(</span><span class="identifier">date_type</span><span class="special">)</span><span class="special">;</span></pre></li>
  64 <li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="identifier">time_duration_type</span> <a name="idp95701280-bb"></a><span class="identifier">dst_offset</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></li>
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