title: Converting dates from imported CSV file
body: <p>I'm importing time series data from a CSV file and one of the vectors/columns are dates in the format DD/MM/YYYY. Vector class is characters or factors if I chose the Strings as factors = True. I convert the imported file to a data frame and then run the following: </p>
  
  <pre><code> df$Date &lt;- as.Date(df$Date , "%d/%m/%y")
  </code></pre>
  
  <p>I get no error message, but the dates are all messed up in the format YYYYMMDD and all the YYYY are the year 2020... </p>
  
  <pre><code>Before:
  10/09/2009
  11/09/2009
  14/09/2009
  
  After:
  2020-09-10
  2020-09-11
  2020-09-14
  </code></pre>