no chance. When creating a filemaker database, the current date and number format of your os will be fixed into your .fp7. Only recreating the fp7 can change this (making an empty copy will be recreating).
So your iwp solution has to format the user-dependent date format for itself.
(anybody who knows better, please post!)
greetings from germany
Hmmm, I thought it was related to the machine it is located on like "Setting System Formats" which is supported in the FileMaker client but not the IWP by the looks of it.