class="special">;</span>
  <span class="keyword">static</span> <span class="identifier">month_type</span> <a class="link" href="acst_dst_trait.html#idp18904800-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="acst_dst_trait.html#idp18905616-bb"><span class="identifier"