title: Convert value stored as hex to date
body: <p>I have data stored in a file in HEX format and I know some examples of what the corresponding date should be. 
  However I am unable to determine how to calculate it. </p>
  
  <pre><code>83 61 94     04/08/2015
  83 61 75     16/07/2015
  83 61 97     07/08/2015
  83  0 135    01/01/1999
  83 51 64     08/10/2012
  </code></pre>
  
  <p>I don't know how the date was encoded originally and have no way of finding out as the data file is old and no longer supported by anyone.</p>
  
  <p>any suggestions as to how to convert the hex to the corresponding date??</p>