title: Excel doesnt recognize date from mysql as date
body: <p>I have mysql db linked to SQL server. 
  On SQL server I am using procedure with DBCC TRACEON(8765) to run mysql query. One of the columns is Date_entered , returning the values in iso format YYYY-MM-DD. Then in Excel I have data connection to run this procedure.
  Problem is that Date_entered in Excel, even though it is in the format YYYY-MM-DD is not recognized in Excel as date. The consequence is that I cannot group this field in the pivot table.
  I even tried DATE_FORMAT in mysql, but still no luck in Excel.</p>
  
  <p>Anybody has an idea please ?
  Thx Petr</p>