title: How to parse milliseconds?
body: <p>How do I use <code>strptime</code> or any other functions to parse time stamps with milliseconds in R?</p>
  
  <pre><code>time[1]
  # [1] "2010-01-15 13:55:23.975"
  strptime(time[1], format="%Y-%m-%d %H:%M:%S.%f")
  # [1] NA
  strptime(time[1], format="%Y-%m-%d %H:%M:%S")
  # [1] "2010-01-15 13:55:23"`
  </code></pre>