tart_delimeter <span class="special">=</span> <span class="identifier">default_period_start_delimeter</span><span class="special">,</span> 
              <span class="keyword">const</span> <span class="identifier">char_type</span> <span class="special">*</span><span class="keyword">const</span> period_open_range_end_delimeter <span class="special">=</span> <span class="identifier">default_period_open_range_end_delimeter</span><span class="special">,</span> 
              <span class="keyword">const</span> <