Hold MENU, and select System > Time/Date.

Time Format

Sets the device to show time in a 12-hour or a 24-hour format.

Date Format

Sets the device to show dates in a MM/DD/YY or a DD/MM/YY format.

Time

Sets the time manually or automatically based on your GPS position.

Time Zone

Sets the time zone for the device. When you set the time automatically, the time zone is set based on your GPS position.

Day. Saving

Indicates whether daylight saving time is observed in your region. The Automatic option sets daylight saving automatically based on your GPS position.