entifier">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>
  <span class="keyword">static</span> <span class="identifier">time_is_dst_result</span> 
  <a class="link" href="null_dst_rules.html#id-1_3_14_15_3_23_2_1_4_5_2-bb"><span class="identifier">utc_is_dst</span></a><span class="special">(</sp