title: how do I sort the list of lists below in groovy
body: <p>i have a list of lists in groovy like this</p>
  
  <pre><code> udbmslList=[
             [133, 2011-11-30 00:00:00.0], 
             [141, 2011-11-29 00:00:00.0], 
             [132, 2011-11-28 00:00:00.0], 
             [11, 2011-12-03 00:00:00.0], 
             [119, 2011-12-02 00:00:00.0], 
             [182, 2011-12-01 00:00:00.0], 
             [12, 2011-12-04 00:00:00.0]
             ]
  </code></pre>
  
  <p>How do I sort the above list in to a single list/Map or keeping the same structure (list of lists) in ascending order of date (there cannot be 2 same dates in list above)
  Also I want to remove the time part of the date.
  Thanks</p>