title: R remove character from date value
body: <p>I have a <code>data.frame</code>, with a typical date column goes like this: <code>29-Jan-14</code>,...</p>
  
  <p>However, some of the date values begin with a character <code>T</code>, they look like this: <code>T29-Jan-14</code>,...</p>
  
  <p>How do I delete that <code>T</code>?</p>