04-01 1807170</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 5 2001-05-01 1522382</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 6 2001-06-01 1444378</span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">at_x</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/seq.Date.html" class="external-link">seq.Date</a></span><span class="op">(</span>from <span class="op">=</span> <span class="fu"><a href="https://rdrr.i