title: Extract date and time in R to include in filename
body: <p>How do include date and time in the filename modifying the below code.       </p>
  
  <pre><code> write.csv(listOfDataFrames1, file = "percent.csv") 
  </code></pre>
  
  <p>Something like percent-date-time.</p>
  
  <p>Are there functions in r that can directly read the system date and time or any way to connect to the web in R to gather such information.</p>