On page 2-11 it says this;
NOTE:This clock is not synchronized with the clock displayed on the navigation system screen.
On page 2-30 of the manual it says how to adjust the clock using the two buttons to the left of the steering wheel;
Settings cannot be accessed while driving. The message, “settings can only be accessed when stationary” is also displayed on the vehicle information display. The switch A and switch B are used in the settings mode. Push the switch B to scroll through the menus. Push the switch A to select a menu. Skip: Push the switch A to move to the warning check mode. Push the switch B to select other menus. Clock: The clock can be adjusted in this menu.
• Back Select this sub menu to return to the top page of the settings mode.• Set Clock Adjust the time (hour and minute) of the clock
. For models without navigation system, the day of the week can also be set to use it for the climate control timer setting. (See “Climate Ctrl. timer” in the “Display screen, heater, air conditioner, audio and phone systems” section.)• 24/12Hr (24 hours or 12 hours) Select either the 24-hour clock display or the 12-hour display.
Here's a video that shows how; https://www.youtube.com/watch?v=4VU4QBfZ3NA