f_week_type</span>                <a name="boost.date_time.acst_dst_trait.day_of_week_type"></a><span class="identifier">day_of_week_type</span><span class="special">;</span>  
  <span class="keyword">typedef</span> <span class="identifier">date_type</span><span class="special">::</span><span class="identifier">month_type</span>                      <a name="boost.date_time.acst_dst_trait.month_type"></a><span class="identifier">month_type</span><span class="special">;</span>        
  <span class="keyword"