</span><span class="special">::</span><span class="identifier">years</span> <span class="special">&amp;</span> y<span class="special">)</span><span class="special">;</span></pre></div>
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<a name="idp56360560"></a><h2>Description</h2>
<p>Subtracts a years object from a ptime. Result will be same month and day-of-month as ptime unless original day was the last day of month. see date_time::years_duration for more details </p>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/bo