Military time is based on a 24 hr clock. If the time is less than 12, then it is AM. 0400 is 4am, 1100 is 11am. If the time is greater than 12 then it is PM, subtract 12 to get the hour. 1600, (16-12=4) is 4pm, 2200, (22-12=10) is 10pm.