date_facet.period_formatter_type">period_formatter_type</a> <span class="special">=</span> <a class="link" href="period_formatter.html" title="Class template period_formatter">period_formatter_type</a><span class="special">(</span><span class="special">)</span><span class="special">,</span> 
                      <a class="link" href="date_facet.html#boost.date_time.date_facet.special_values_idp29995904">special_values_formatter_type</a> <span class="special">=</span> <a class="link" href="special_values_fo