In BlackBerry Curve 8520 Smartphone, the time zone can be changed using the Options menu. To set the time zone, press the menu button. This would display the following list of menus.
Select Options from the available list of menus.
In the Options screen, navigate to Date/Time options.
In the Date/Time screen, navigate to to Time Zone section.
Using the Time Zone drop down as shown above, you can change the time zone information in BlackBerry Curve 8520 Smartphone.