external-link">as.Date</a></span><span class="op">(</span><span class="st">"1973-01-01"</span><span class="op">)</span><span class="op">)</span>,</span>
<span>         <span class="va">force</span> <span class="op">==</span> <span class="st">"true"</span><span class="op">)</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html" class="external-link">%&gt;%</a></span> </span>
<span>  <span class="fu"><a href="https://dplyr.tidyverse.org/reference/mutate.html" class="external-link