Math Memes

The U.S. 12h clock is stupid: 12PM + 1h = 1PM

If you don't use a 24h clock at least do it like the Japanese, who also use the 12h clock and have: 0:00 PM + 1h = 1:00 PM

It’s a lot of different things it’s design is based on the sundial, we already had base 12 time

Wikipedia page for base 12, the origin is a fun read and while I can’t say it’s all accurate, the parts I know are

https://en.m.wikipedia.org/wiki/Duodecimal

😶

The day starts at zero, not 12. 12 is "Noon" ie halfway through the day. The clock starts at 12 because it's more practical than inscribing 24 divisions in a circle. And the 6 doesn't "mean 30", it's simply the hour marking at the bottom of the circle. Finally, the 12 hour clock was invented after the 24 hour day, not the other way around.

And inb4 "I bet you're fun at parties". I'm all for "this logic is ridiculous" jabs, but this is just misrepresenting everything to make it sound stupid. Everything sounds stupid when you purposefully get it wrong.

Base 12 you filthy casual

You fools need to submit to the 4 simultaneous separate 24 hour days within a 4-corner (as in a 4-corner classroom) rotation of Earth.

"There is no teacher on Earth qualified to teach Nature's Harmonic Simultaneous 4- Day Rotating Time Cube Creation Principle, and therefore, there is no teacher on Earth worthy of being called a certified teacher."

-Gene Ray, Visionary

Actually that is not funny to make fun of thing you don't understand.

A clock is a marvel using a plan to represent both numerically and in volume the time passing in an infinitly précise manner as it is continuous. Human reading precision can be chose at the level of the hour, the minute of the second. The 12-base allow a reading of the twelveths of the time period, the thirds, the halves and the quarters. The use of a circle make it possible to use it as a chronometer at any given start and follow the passing of time as your society see it.

That is just the data representation part!

The clock is also a marvel of ingeneering in the backend with very complex mecanism giving it a excellent precision and the abillity to run on many many different type of power.

The day starts at zero, the only way that makes sense.

And that's why the way that am/pm is indicated is fucking lunatic.

Try 24-hour time for a month. It's slightly weird at first solely because 1) everyone else uses 12-hour and 2) you've used 12-hour your whole life, but after that it's great and frankly better than what you use now. Translations between 12-hour time become 100% automatic, so you can use it in your personal life without feeling like you're switching (you might even get one or two friends to join you). The following are advantages just for you, not accounting for the larger advantages that come when everyone is using it:

• You can drop the AM and PM on digital clocks with no loss of information. It's a small thing, but this gives me room for a seconds position on the clock on my taskbar. (Side note: given 8 billion people on Earth and given how often time shows up, I feel like these trillions of miniscule savings getting rid of AM and PM might add up to something actually meaningful.)
• You'll never have that experience where you oversleep during a nap so badly that you get confused if it's AM or PM.
• Most intervals we usually talk about for things (e.g. "I have school from 6:00 AM to 2:00 PM" or "I have work from 9:00 AM to 5:00 PM.") do not include midnight in their range (e.g. "I slept from 9:00 PM until 6:30 AM"). Thus, arithmetic is easier because you don't have to account for the modulus (at worst in the latter example, it's the same). For example, when I go to school from 06:00 to 14:00, that's just 8 hours. When I work a 09:00 to 17:00, that's 8 hours. It's just the actual arithmetic. It's currently 10:00 and the assignment is due at midnight? Then I have 14 hours left to get it done. Whereas for 12-hour time, I need to account for the modulus: "okay, there's x hours on this side of the 12 hours and y hours on this other side; add those" is how I probably do it in my head. Subtracting times is especially nice. For example, if something has been happening since 00:30 and it's now 13:45, then I just need to subtract 30 minutes from 45 and I immediately have my answer. 1:45 minus 12:45, meanwhile? Nah. This also makes timezones much easier to do mentally. If I have +14 for my time and it's 06:00, then I know it's 20:00 there. Trivial. You do lose that sweet spot where something is exactly 12 hours apart, but that's miniscule compared to how easy everything else is.
• Starting at 00:00 for midnight instead of 12:00 is just so much nicer. 12-hour time has no 0, which to me is just kind of stupid. Namely for aesthetic, intuition, and arithmetic reasons.
• If speaking to someone internationally, intuitively knowing both formats means you don't even need to think about a conversion (let alone do one at all once you really get it down). Lots of countries use 24-hour time orally and written, and even more use it just in writing.
• Date and time formats use 24-hour rather than 12-hour time, so you can read these automatically instead of needing to convert.
• This one's very unobjective, but I feel like I've been less inclined to go to bed late when dealing with larger numbers. "Oh, it's just nine" versus now the 20s are "late" and when I really need to start thinking about how and when I'm going to bed. Obviously it's possible this is just my monkey brain being weird in a specific way and that nobody else would have this, so pay attention to the other reasons instead.
• (Not beneficial to an individual using it on their own as an adult, but I wanted to bring it up.) It's arguably slightly easier for kids to learn. Kids aren't up at midnight, and so they don't really have to care about the clock rolling over while they're fast asleep (if they do, they get the much more intuitive '0' than '12'). On the other hand, the clock rolling over at noon means you as a kid really do need to understand how that works.

It's just objectively better in most meaningful ways, and like the metric system:

• Its benefits are most evident if you grew up with it and everyone around you uses it.
• Its benefits would still be evident if everyone switched to it but hadn't grown up with it.
• Even if you didn't grow up with it and no one else around you uses it, it can still benefit you to use it.

ever think about how 5 is 1/12th of 60? that means putting 5 min and 1h on top of each other is genius imo. because there are 12 times more minutes in an hour then there are hours in a day

The clock evolved out of the sundial. 12 hours on the clock makes more sense if you think of it that way.

12/24 hours come from the idea that there are 12 day hours and 12 night hours. Historically most clock systems counted hours since sunrise. Counting since midnight is a recent change.

Where the 12 comes from? No idea. That's a decision that was made several thousands years ago. It could be from some smart counting of fingers, joints, etc. It could come from the fact that 12 has a lot of dividers. It could be religious reasons (zodiac has 12 animals). Honestly no idea.

The Babylonian calendar and relation between time and distance is incredibly interesting

https://en.wikipedia.org/wiki/Babylonian_calendar