n class="special">,</span> <span class="keyword">const</span> <span class="identifier">time_duration_type</span> <span class="special">&amp;</span> td<span class="special">)</span><span class="special">;</span></pre>Calculates if the given local time is dst or not. <p>Determines if the time is really in DST or not. Also checks for invalid and ambiguous. 
</p>
</li>
<li class="listitem"><pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="id-1_3_14_15_3_23