Change the Date Format at global level for ADF Application

Specifying Global data & format for application .

To change the date format of your application, without necessarily affecting other locale settings like Language(localized text) ,or to established a standard global date format across different locales/countries, define the <formatting-locale> element of the trinidad-config.xml as illustrated below: 

<?xml version="1.0" encoding="windows-1252"?>
<trinidad-config xmlns="http://myfaces.apache.org/trinidad/config">
  <formatting-locale>en-GB</formatting-locale>
</trinidad-config>

<?xml version="1.0" encoding="windows-1252"?>
<trinidad-config xmlns="http://myfaces.apache.org/trinidad/config">
  <formatting-locale>#{userSession.formattingLocale}</formatting-locale>
</trinidad-config>

Refer the blog below ..

http://soadev.blogspot.in/2010/03/change-global-date-format-of-your.html

http://soadev.blogspot.in/2010/03/adf-faces-rc-supplement-on-how-to.html