class="keyword">bool</span> <a class="link" href="dst_calc_engine.html#id-1_3_14_15_3_23_2_1_2_6_2-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>
  <span class="keyword">static</span> <span class="identifier">time_duration_type</span> <a class="link" href="dst_calc_engine.html#id-1_3_14_15_3_23_2_1_2_6_3-bb"><span class="identifier">dst_offset</span></a><span class=