You can set a timer to automatically turn off your device when it is idle for a set period of time. The options include Never, 30 minutes, 20 minutes, and 10 minutes.
4. Tap 
to save the changes.
8.6 Date&Time
1.Tap the Settings button on the Home screen.
2.Tap the Date&Time button.
3. To change the time zone, tap the left/right arrow in the “Time Zone” item.
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