Low,
1 - Your idea is applicable when the OW User Profile Date Format is blank (default); in this (particular) case, the Date Format defaults from the Operating System (Regional option)!
2 - As far as I know, JDE uses a Julian Date Format in its transactions, therefore its data is Date_Format_Independent.
Warm regards,
Adrian Chimirel
PS See what Sebastian suggested: << ... GH9011, User Profiles, select the specified OneWorld User, choose Date Format = 'DME' and Date Separator Character = '/'. In order to avoid nasty problems, check also that your clients and Enterprise Server has the same date format.>>