Samsung Galaxy Tab 2 users can change the timezone using the options available as part of Date & Time settings.
Step 1: Tap the menu button then the Time display as shown below.
Step 2: Touch the Date and Time value displayed in the Popover.
This would provide the option to edit the date and time settings as shown below.
Step 3: In the Date & Time settings, tap the Select time zone option.
Step 4: Now choose your desired time zone from the list of values.