pan> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">months</span> <span class="special">&amp;</span> m<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.14.15.5.3.7.4"></a><h2>Description</h2>
<p>Subtracts a months object from a ptime. Result will be same day-of-month as ptime unless original day 