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You will also have to add the timezone entries to the file src/main/resources/i18n/messages.properties for display in the JSP pages.
The default timezone is stored as a portlet preference named 'timezone'. You can override this via channel configuration or via editing the portlet.xml for the portlet. By default it is 'America/Chicago'. Consult a list of timezone values, such as http://www.vmware.com/support/developer/vc-sdk/visdk400pubs/ReferenceGuide/timezone.html or http://en.wikipedia.org/wiki/Zone.tab