12-hour clock vs. 24-hour military timeA side-by-side look at the 12-hour clock times and the corresponding military/24-hour clock times.
12-hour am-pm clock
24-hour military time
Military time (or astronomical time) is based on a 24-hour clock. It is a method of keeping time in which the day runs from midnight to midnight, and is divided into 24 hour increments. This is the most commonly used time notation in the world.
When keeping time in this fashion, the day starts at midnight and is written as 00:00. The last minute of the day is written as 23:59, or one minute before the next midnight. Sometimes you may see 00:00 written as 24:00. Both are acceptable. A usage example showing the 12-hour clock vs military time would be a time table showing 4:00 pm to 12:00 midnight. This would be written as 16:00 – 24:00 in military time. Another example highlighting the difference between the two would be to show that 10:15 am is written as 10:15 in military time but 2:30 pm is written as 14:30 in military time.
Common uses of the military time format
Military time is most commonly used by the military, government, public transportation, hospitals, meteorologists, astronomers, those employed in emergency services, and also with computers. When speaking in military time, 09:00 may be stated as “zero nine hundred” or “oh nine hundred”. In the military, military times are often written without the colon, so 07:52 would rather be written 0752.
Time stamps referencing Greenwich Mean Time (GMT for short – often interchanged with Coordinated Universal Time/UTC) is denoted by a “Z” at the end, and is written as 0752Z. The local time is denoted by a “J” at the end, and the eastern time zone is denoted by an “R” at the end. Each of the military time zones have a corresponding letter and name.