Our team of seasoned copywriters ensures each topic is fully explored with a focus on delivering the answers you need in a timely fashion. Most watches and alarm clocks have an option to convert the time to 24-hours. In formal writing, the word “hours” is always added. However, in conversations, when your meaning is obvious, it’s very typical to drop the “hours”. Yes, then you must have noticed when they speak about the timing, you think about a few seconds, right? They have the time change because of the 2100 military time. If the time is past 1200 or noon, subtract 12 from the number and you get the civilian time. Converting to military time involves straightforward addition, which typically takes a short amount of time to master. With a system of time based on a 24-hour clock rather than twelve-hour intervals of am and pm, the hour numbers do not repeat. The primary reason for using military time in the Armed Forces is to avoid any confusion that may arise with the am/pm time system. In military time, as numbers are not reused, but instead, each hour has its own number. Hipparchus, an astronomer, came up with a set amount of time regardless of the season, around 147 to 127 BC.