title: Find day of year with the lubridate package in R
body: <p>I'm looking to find the day of year for a POSIXct class object with lubridate. For example, <a href="http://www.esrl.noaa.gov/gmd/grad/neubrew/Calendar.jsp" rel="noreferrer">12-9-2015 is day 343</a>. </p>
  
  <p>It's easy to find the day of the week or month with lubridate:</p>
  
  <pre><code>&gt; lubridate::wday("2015-12-09 04:27:56 EST", labels = T)
  Wed
  &gt; lubridate::day("2015-12-09 04:27:56 EST")
  9
  </code></pre>
  
  <p>Is there an easy way to do so for the day of the year? I've searched the documentation and other questions but have not (yet) found an answer. </p>