title: Dplyr mutate add +1 to column
body: <p>I want to compute for the difference between 2 dates and add + 1 to the result column. I have a large data set. How can I execute this?</p>
  
  <pre><code>library(dplyr)
  
  diff &lt;- df %&gt;% mutate(diff = as.character(as.Date(date1, format = "%m/%d/%Y") - as.Date(date2, format = "%m/%d/%Y")))
  </code></pre>
  
  <p>Have already performed subtracting date 1 from date 2 and would like to add + 1 to this column</p>