What military time representation is used for 9:00 PM?

The military time representation for 9:00 PM is 2100. In the 24-hour clock system used by the military, the hours after noon start at 13:00 for 1:00 PM and continue up to 24:00, which represents midnight. Therefore, 9:00 PM is calculated as 12 hours added to 9:00 AM, resulting in 21:00 or 2100. This format helps avoid confusion between AM and PM times, ensuring clear communication in various situations, such as operations and schedules. Understanding this system is crucial for effective coordination and accuracy in military timekeeping.