In military time, 2200 hours is 10 p.m. Military time is based on a 24-hour clock, and it is one of the most used time systems in the world.
Military time is based on a 24-hour time period from midnight to midnight; 1 a.m. is 0100 hours, 2 a.m. is 0200 hours, and so on. Unlike traditional timekeeping, the time does not start over after noon. Instead, 1 p.m. is 1300 hours in military time. This is intended to remove confusion. When writing out hours and minutes, military time does not use a colon to separate the hours and the minutes.