s="st">'01/01/200'</span>, <span class="va">.x</span><span class="op">)</span><span class="op">)</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>  units <span class="op">=</span> <span class="st">'years'</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] 12.999316  6.001369 12.000000  6.001369 11.000684</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co">