title: Determining the exact time a photo was taken using Matlab
body: <p>I have a question of precision.
  I have a number of images (photographs) taken during an experiment. I would like to mark the times that the picture were taken on a plot. To get the file information I am using:</p>
  
  <pre><code>fileinfo = dir('myfile.jpg')
  
  fileinfo = 
     name: 'myfile.jpg'
     date: '16-Mar-2006 13:34:01' %My problem is here!!
    bytes: 251
    isdir: 0
  datenum: 7.3275e+005
  </code></pre>
  
  <p>The photos were taken in quick succession and I would like to get decimal accuracy but Matlab is rounding it to the nearest second. 
  Any ideas how to get something like <code>13:34:01.34</code>. Is the <code>datenum</code> more accurate? Thanks</p>