FormatDateTime question

I set my computer Regional Setting (Control Panel - Regional and
Language Options - Customize - Date) to dd/mm/yy.
In my ASP page I do the following:

FormatDateTime("1/20/07",2)

and it returns 1/20/07 instead of 20/1/07.

I though my setting it to 2, it will display a date using the short
date format specified in your computer's regional settings, how come
it is not ?
How can I set the string to display a date using the computer's
regional setting ?
Thank you.