Changing the Clock Format via Desktop GUITurn on your Raspberry Pi and open the desktop environment.Move your mouse to the clock display in the upper-right corner of the screen.Right-click the clock.Select Digital Clock Settings (or Configure Plugin) from the menu.Look for the field labeled Clock Format or Time Format.Clear the existing text and type %I:%M %p to show a 12-hour format with AM/PM and no seconds, or %r if you want the seconds to tick.Click OK or apply to save your changes