The Navy operates on a 24-hour day. Aboard ship you will see a clock with a 24-hour dial. Hours of the day are numbered 1-24; at noon, instead of starting again at 1, the Navy goes to 13. The hours, for example 8 a.m. or 7 p.m., are called 0800 (zero eight hundred) and 1900 (nineteen hundred) respectively. NEVER SAY "nineteen hundred hours." Hours and minutes in the Navy go like this: 10:45 a.m. is 1045 (ten forty-five), 9:30 p.m. is 2130 (twenty-one thirty). The following is a 24-hour dial to help you learn Navy time.