title: averaging time information
body: <p>I have two cell array with time information:</p>
  
  <p>here is the example:</p>
  
  <pre><code>'2012-05-10'
  '2012-05-10'
  '2012-05-10'
  '2012-05-10'
  '2012-05-10'
  '2012-05-11'
  '2012-05-11'
  
  '19:28:27.000'
  '19:28:38.000'
  '21:57:31.000'
  '21:57:37.000'
  '21:57:40.000'
  '21:57:43.000'
  '21:57:50.000'
  </code></pre>
  
  <p>I just needed two time information like i do unique:</p>
  
  <pre><code>'2012-05-10'    '19:28:27.000'
  '2012-05-11'    '21:57:40.000'
  </code></pre>
  
  <p>I will some time have this too:</p>
  
  <pre><code>'2012-05-10'
  '2012-05-10'
  '2012-05-10'
  '2012-05-10'
  '2012-05-10'
  
  '19:26:27.000'
  '19:26:38.000'
  '21:55:31.000'
  '21:57:37.000'
  '21:55:40.000'
  </code></pre>
  
  <p>How do i go by doing this.</p>