I'm not familiar with a program named Spreadsheet 9. But, if it's an Office program as you said, there should be a Help button. Just type in keywords to your problem. Also, try looking in the format menu
HOWTO: Set the ASP Locale ID Per the Browser's Language Settings http://support.microsoft.com/?id=229690
When you create an Active Server Pages (ASP) application that multiple internation sites access, it is beneficial to modify the Locale settings so that the VBScript Date, Time, Currency, and so forth formats return the correct format for the location of the user.