Time Settings
Hold MENU, and select Settings > System > Time.
Time Format: Sets the device to show time in a 12-hour or 24- hour format.
Set Time: Sets the time zone for the device. The Auto option sets the time zone automatically based on your GPS position.
Time: Allows you to adjust the time if it is set to the Manual option.
Alerts: Allows you to set sunrise and sunset alerts to sound a specific number of minutes or hours before the actual sunrise or sunset occurs.
Sync With GPS: Allows you to manually sync the time with GPS when you change time zones, and to update for daylight saving time.