title: how to convert a long to a much shorter string
body: <p>Ideally, we would like to take a long(System.currentTimeMillis in java) plus a postfix long as well and convert it to a set of characters+numbers in a much shorter string.  We only want uppercase letters used.  Is there a library for this already as it would seem like a very re-usable library for generating keys that users can type in easier as they are shorter.</p>
  
  <p>I guess I could always write one but it would be nice to easily just grab someone else's code/library.</p>
  
  <p>example</p>
  
  <ul>
  <li>0 = 0</li>
  <li>1 = 1</li>
  <li>2 = 2</li>
  <li>the rest digits</li>
  <li>11 = A</li>
  <li>12 = B</li>
  <li>13 = C</li>
  </ul>
  
  <p>so I can take a number and reduce the number of digits quite significantly.</p>
  
  <p>thanks,
  Dean</p>