# When did military time start

## When did 24 hour time start?

Hipparchus, whose work primarily took place between 147 and 127 B.C., proposed dividing the day into 24 equinoctial hours , based on the 12 hours of daylight and 12 hours of darkness observed on equinox days. Despite this suggestion, laypeople continued to use seasonally varying hours for many centuries.

## Why did they create military time?

Purpose of Military Time Military time is used because it avoids the confusion between A.M. (morning hours) and P.M. (evening hours). For example, 0700 hours can only mean 7:00 in the morning because military time does not have 7:00 at night. 7:00 at night would be 1900 hours.

## Which countries use military time?

9) Eighteen (18) Countries use the 12-hour clock: Australia, Bangladesh, Canada, Colombia, Egypt, El Salvador, Honduras, India, Ireland, Jordan, Malaysia, Mexico, New Zealand, Nicaragua, Pakistan, Philippines, Saudi Arabia and U.S. (although the military uses the 24-hour clock).

## Who first used the 24 hour clock?

Our 24-hour day comes from the ancient Egyptians who divided day-time into 10 hours they measured with devices such as shadow clocks, and added a twilight hour at the beginning and another one at the end of the day-time, says Lomb.

## Why are there 60 minutes in an hour?

THE DIVISION of the hour into 60 minutes and of the minute into 60 seconds comes from the Babylonians who used a sexagesimal (counting in 60s) system for mathematics and astronomy. They derived their number system from the Sumerians who were using it as early as 3500 BC.

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## Who invented time?

The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today’s clocks measure. For the Egyptians , and indeed for a further three millennia, the basic unit of time was the period of daylight.

4:00 pm

3:00 PM

11:00 p.m.

## Do all hospitals use military time?

But the perhaps most crucial use of military time is among medical workers: doctors, nurses, EMTs—everyone. Imagine you’re sick, you’re in the ICU, and you need a specific medication at 6:00 p.m. on the dot, daily. To avoid even the slightest margin of error, the 24-hour clock is used .

## Do police use military time?

Its just a military time clock, most police stations function through this system, its more efficient that way. That’s probably because officers are required to use 24 hour format in official documents, but since civilians use 12 hour clocks, too many mistakes were made.

## What countries use AM and PM?

Most countries around the world today use the 24-hour system. However, the 12-hour format , including am and pm, is officially used in a number of countries, including the United States, Canada (except Québec), Australia, New Zealand, and the Philippines.

## Whats does AM and PM mean?

Latin ante meridiem and post meridiem

## What is 22 oclock?

7:00 PM equals 19:00. 8:00 PM equals 20:00. 9:00 PM equals 21:00. 10:00 PM equals 22 :00.

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23 hours