title: Number of days in the month in R?
body: <p>I'm trying to get the number days in the given month. But I can not figure out how to strip out just the number portion from the "days_in_month" function. </p>
  
  <pre><code>require(lubridate) 
  st &lt;- as.Date("1998-12-17")
  en &lt;- as.Date("2000-1-7")
  ll &lt;- seq(en, st, by = "-1 month")
  t&lt;-days_in_month(ll)
  </code></pre>
  
  <p>This is returning:</p>
  
  <pre><code> Jan Dec Nov Oct Sep Aug Jul Jun May Apr Mar Feb Jan 
   31  31  30  31  30  31  31  30  31  30  31  28  31 
  </code></pre>
  
  <p>I do not want the Jan.... How to do go about just getting the vector of numbers?</p>
  
  <p>Thank you</p>