- Go to File > Options > Results Format, choose [None] for MySQL DATETIME.  See attachment 1.
- In Query Analyzer, query some Datetime columns.  The values are displayed correctly in the Grid Results.
- Choose "View as Spreadsheet" or "Save Results" as an Excel spreadsheet, the values are displayed in an incorrect format in the spreadsheet.  See attachment 2.
 

If I choose [Default] for the result format, the values are displayed correctly in the spreadsheet.