I personally don't associate it with the military, but I'm the exception to that. Lots of people call it "military time" here.

Not quite. It's anything that meets the minimum for the military. This, for most normal items, means getting the job done and lasting long enough, with an emphasis on low cost and bulk production. The result is "military grade" usually being the absolute worst that still works.

As someone that outdoors a lot, this shit is great for many items. If I base camp, all my water containers are military, and I have 120mm ammo boxes for food and stuff because animals, water, and air can't get in. Heavy and inconvenient as hell, but cheap af and works well—that's military crap for you.

I always saw it as "a ton of money is thrown at R-D on this one specific thing to make it do that ken specific thing really well"

It is, but a lot of people think it high-quality. I believe the saying goes "an engineer isn't someone who can make something work, it's someone that can make something barely work." Idk, I'm going into welding, not my expertise.

When I was a civilian, everyone called it military time, because only the US military used it.

When I joined the US military, they called it International Time, because the rest of the world used it and we were just meeting international standards so there's no confusion with our global allies.

I just call it 24-hour. I, too, hate the "military time" name, but it's common here in the states.

Its just called time.

How many hours does it take the earth to spin? 24? Nah lets split it up into 2 12s because our people can't count higher.. And then lets make it have confusing AM PM tags depending on if its one or the other

Like fuck off you gonna have the 60 mins of the hour also be split into 4 so you dont have to count that high??

24h clock Is the norm

750ml Bourbon

There is, you have two sets of numbera for each hour marking like this:

or like this:

This requires no change to the time mechanism, so you can pretty easily modify the face of any standard analog clock to be like this.

In Brazil, the 24hr clock is standard for most people.

You mean since you were 0?

If you see a clock say 12:00 and it's not sunny outside and you're not above a certain latitude: it's midnight

In ancient times, people did not have the concept of a "civil day"; they viewed day and night as separate things which alternated.

The Assyrians divided the day into six equal parts, and the night into six equal parts, called ush. But because sunrise and sunset move around over the course of the year, the lengths of day and night vary, and thus one ush during the day would not be the same length as an ush at night except around the equinoxes.

The Babylonians divided ushes in two to make hours, because it was easier to do astronomy in 12s than 6es. This resulted in 12 hours in a day and 12 hours at night, but daytime hours were still different lengths to nighttime hours, and the lengths of hours still varied over the course of the year.

The Greeks partially adopted the Babylonian system; they divided the day into 12 hours but the night was divided into four watches. The Romans copied the Greek system, but later went full Babylonian with 12 hours at night as well. (I feel like this coïncided with the rise of Christianity, but I have no evidence). The Romans introduced the concept of the civil day beginning at midnight (which the Chinese independently came up with), and over time, this led to the idea of 12 hours from midnight to noon, and 12 hours from noon to midnight. That idea postdates Rome, however; Roman hours were reckoned from sunrise to sunset and sunset to sunrise.

Assyrian astronomical knowledge seems to have reached China via India, as traditional Chinese timekeeping divides the civil day into 12 shi. Ancient shi were like Assyrian ushes; they were either 1/6 of a day or 1/6 of a night. Originally, midnight and noon fell in the middle of a shi, but this was changed to shi starting at midnight to make administration and astronomy easier. This system of variable-length shi continued to be used in Japan until about the Meiji Restoration.

Fixed-length hours are the result of analogue clocks, which are impractical to design to change the lengths of hours with the seasons (but not impossible; the wskusei clock is an ingenious Japanese clock from the 17th century that does exactly that). China had reliable, accurate water clocks by the Tang dynasty, while Europeans developed circular mechsnical clocks in the late Middle Ages. In neither case was it practical to make something as clever as the wakusei clock, so analogue clocks were marked the mean length of a shi or an hour as a reasonable approximation. Since there are 12 hours from midnight to noon and 12 from noon to midnight, that led to the 12-hour time system we know today.

You've never seen an analog clock?

That's where it comes from, and that's where it makes perfect sense. (An 8 hour reset wouldn't) No need to carry that over to digital clocks however.

Japanese people that understand 24h notation‽ In my experience with language exchange I've always had the issue that language exchange partners didn't understand 24h notation at all!

I also can't remember seeing this notation on opening times in my visits there, but maybe I haven't been paying close attention…

While trains were the big "clock unifiers" back then, here in Europe, the 24h clock is generally the local version of "time", without the "military" part.