Changing date format for a particular user in Peoplesoft

You can change personalisation setting for a particular user by going to Main Menu > My Personalizations

If you want to change settings for a lot of users then you will have to update the PSUSERPRSNLOPTN table for that oprid.Following are the USER_OPTION_VALUE values for date format

D - DDMMYY

M - MMDDYY

Y - YYMMDD

The USEROPTN value to be used is DFRMT