title: How to convert decimal date format (e.g. 2011.580) to normal date format?
body: <p>I'm trying to change from the decimal date format (return type of cpts.ts() from the changepoint package) to the normal date format %Y-%m-%d. Example:</p>
  
  <pre><code>cpts.ts(myTimeSeries.BinSeg)
  [1] 2001.667 2004.083 2008.750 2011.583 2011.917
  </code></pre>
  
  <p>The actual dates are sometime around August 2001, January 2004, September 2008, June/July 2011 and December 2011 (I don't know them exactly, I'm reading them off a graph).</p>
  
  <p>I can't seem to find a standard method of converting this format back to the usual date format.</p>
  
  <p>Can anybody help me?</p>
  
  <p>Thanks </p>