ormatter</span></a><span class="special">(</span><a class="link" href="date_facet.html#boost.date_time.date_facet.period_formatter_type">period_formatter_type</a><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="date_facet.html#idp20376464-bb"><span class="identifier">special_values_formatter</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_facet.html#boost.date_time.date_facet.special_v