itle="Header &lt;boost/icl/gregorian.hpp&gt;">boost/icl/gregorian.hpp</a>&gt;

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<span class="keyword">struct</span> <a class="link" href="has_difference_bo_id662960.html" title="Struct has_difference&lt;boost::gregorian::date&gt;">has_difference</a><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="