Dates are stored as simple numbers (the number of days since
0-Jan-1900), regardless of how they are formatted for display.
Changing the display format doesn't affect the underlying value of the
cell. Therefore, you can simply apply the English date format to the
cells. Select the cells to reformat, go to the Format menu, choose
Cells, and then the Number tab. Select Custom from the categrory list
and enter the English date format, something like dd/mm/yyyy or
whatever the English use. This will affect the displayed format, but
will not change the actual date values.
Cordially,
Chip Pearson
Microsoft MVP 1998 - 2010
Pearson Software Consulting, LLC
www.cpearson.com
[email on web site]