jxl problem with DateTime

[basm101]

I am trying to write a Date into an Excel spreadsheet using JExcel.

However, this:

cell = new DateTime(columnIndex++, rowIndex, (Date) myDate);

where columnIndex and rowIndex are integers and myDate is a Date like this:
Sat Sep 01 15:00:00 BST 2007 (seen like this when writing out to System.out as a toString())

I then add the cell to the spreadsheet

worksheet.addCell(cell);

The problem is, an hour gets knocked off the date in the spreadsheet..

e.g.

01/09/2007 14:00 appears for the date Sat Sep 01 15:00:00 BST 2007

Any ideas why ? I don't actually mind if I can get rid of the time in the spreadsheet alltogether and just keep the date. I have tried using DateFormat and converting cellData to a String and cutting off the time, but this just means the excel cell has a time of 00:00 and sometimes sets the date back by one day as well !

please help..
thanks