Consider a message system that has a DateTime attribute to store the time of the latest change made to each message. User "A", who is in Buenos Aires, saves the time 10/12/2011 17:15 in a server located in Miami. User "B" is in Tokyo, and upon opening the message he will want to see the time of last change made to the message according to his TZ, not that of Buenos Aires (where the message originated) or Miami (where it was stored).
To solve this scenario, enable TimeZone Support in the application. Doing so will enable the user to view the data in the corresponding time zone.
View DateTime values in a selected time zone - TimeZone Scenario