As someone who grew up with a 24-hour clock, I can deal with 12 hours. Usually there’s no confusion if your store opens at 7am or 7pm. But 12:30PM being a valid time and meaning ‘00:30 on the next day’ fucks me up every time.
12:30 AM is 00:30 though?
They shouldn’t even have 12 on the clock, it should be 0 because the 12 hour clock is modulo 12.
He did say it always fucks him up :D
12:30PM means 30 minutes after 12-noon.
Anyone saying that and meaning the middle of the night is just wrong, and if that’s a genuine thing people do it would drive me quite mad.
30 minutes after midnight is 12:30AM
As I said, it always fucks me up. The AM/PM indicator wraps at a different hour than the hours. Aaargh!
Literally this. I was never in the military, and I’m glad they literally can’t draft me unless they lower a lot of requirements really fast. But 24-hour time is just so much more sensible. There’s no “AM or PM?” follow-up question, no guesswork. It just makes sense.
If they made metric time, I’d adopt that shit in a heartbeat.
the standard time that almost everyone uses is metric, i.e. is part of the metric system, its units are SI units. there was a system of decimal time, if that’s what you mean, developed in France during the revolution, where a day is 10 hours, each 100 minutes, each 100 seconds
so a decimal hour is 2.4 standard hours
a decimal minute is 1.44 standard minutes
a decimal second is 0.864 standard secondsI think it’s cheating to call it metric if it’s not decimal. Even some of the oldest analog clocks had 24-hour faces, they were just a bitch to read in a watch-size. You still have to do stupid math to figure out duration past the 12 or 24, and even with the 60 minutes/1 hour. Nothing metric or superior about it.
The French tried metric time. It was pretty quickly abandoned.
how heartbeat? I have a metric calendar that only one other person likes. 13 months of 4 weeks of 7 days, with one day leftover for celebrating my birthday (because i decided we’re doing the calendar, the day off is my birthday suck it trebek)
12:30 pm is half-past noon.
12:30 am is half past midnight, or as you would say 00:30
The m is “meridian” which is noon (sun straight up)
The a is ante/before and the p is post/after
In olden days it was easier to look up and set your clock at noon than midnight.
By the definition of post meridian, though, half past noon should be 0:30 pm.
We use the 12 at both ends because there it is sitting at the top of the clock
It doesn’t mean that.
are Americans really confused with 15:30?
Nah, all you need is a little time to get used to it. It’s my default setting on most of my devices. Once you get used to it, it’s much easier to tell am vs pm at a glance, which is helpful when looking at timestamps (I work in IT, timestamps are important.)
I switched after being in a job where “meeting at 6” or “I’ll get in at 9” was 50/50 am or pm and I got sick of guessing and sometimes being 12 hours off.
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Shouldn’t the system be storing timestamps in UTC anyway, and then displaying them in whatever localization settings you have?
I meant more for my personalized reading through logs. Some of our systems do log in UTC without correction, and they’re sometimes annoying.
No, it’s just a familiarity thing and not even rare. It’s like switching between metric and imperial units, if you’re used to seeing something in one format it can be jarring to switch it in your head at a moments notice. A lot of people in the US use 24 hr time if they have a job relating to documentation or if their working hours can cause confusion.
For example, I have a client that has to document received material and they are open from 04:00 - 22:00. They use the 24 hr format because it is common to receive material at both 04:00 and 16:00 and having to make an extra column to type am or pm on their logs is stupid and is just another opportunity to make a mistake.
It’s really not a big deal to anyone, if you get a job that uses it then you switch your phone and within a week or two it’s second nature. Every blue moon someone will notice that all your clocks are set to a 24 hr clock and someone might ask why or what you do to need it, but that’s it.
I grew up with a Betamax tape player under the family TV. It had a 24 hour clock and it was the timepiece in the house that was in the right spot to tell us all that it was bedtime. As a result I have an intuitive feel for the 24 hour clock. But if you haven’t used it regularly, which most ordinary Americans don’t, then yeah you just have to stop and do the arithmetic before you can connect 21:00 to your sense of time.
You know what fucks me up is that 21 has a “nine-ness” quality to it now that sometimes makes me mess up real math.
Hah I can believe that.
I’m not technically synaestehtic but I do have strong associations between numbers and colors, days of the week and colors.
Saturday has always been blue. Sunday is red. Number 4 is green, 3 is yellow, etc.
For a time I moved to an Islamic country where Friday is the holy day, not Sunday. So the weekends were Thursday-Friday and not Saturday-Sunday.
What was weird is that my red/blue associations with Saturday/Sunday shifted onto Thursday/Friday after a long time of living like this. And then I left that place and my associations shifted back.
The “nineness” of a thing, as you say, is hard to describe.
Do you think the sat/blue sun/red thing comes from calendars? I don’t think about it often, but I do think there is a “redness” to sunday.
oh that’s easy. all multiples of three, you add their digits and the digits add up to three.
also if you’ve made a transposition error (179 instead of 197) you will be off by a multiple of 9.
sorry bookkeepers i just gave away your trade secret. the one.
Written as 1530, mostly only Americans who have been in the military and their friends will know what you mean.
15:30 they’ll know it’s a time.
And doctors, nurses, lab technicians, etc, plus anyone who can subtract twelve.
what is that, like extra noon or something?
I think they see it as some kind of metric time, and therefore something to be avoided at all costs.
Yes, it angers and confuses them.
Pilot here, over been in the habit of using 12 hour for local time and 24 hour for zulu time. “12:45pm, 1745z”
No, we just have to do a little kindergarten (age 5) math, the difference between 12 and 15 is 3.
The 3rd-grade math (age 8) of figuring what time it will be 9 hours and 47 minutes later is equally difficult whether using 24h or am/pm. And may be easier using angles on an analog clockface, especially for an old fart like me.
The real problem with time isn’t 12h vs 24h. It’s the increments 12/24/60/30/15/5 when the rest of our system is base 10.
Oh and Daylight Savings. Jet lag without getting to go anywhere. Fuck that shit.
I do it because then I don’t put my calendar appointments in at oh, 3:00 AM.
15:00 is SOOOOOO much better for adhd me.
Also: it makes total sense! 24 hours, 24 separate numbers. It’s the most logical conclusion.
24hr time is simply superior in every way. I don’t get why more people dont swap it.
I changed mine on a whim years ago and never looked back.Like the old truth “America does everything the wrong way”. 24h is superior, metric is superior, dd.mm.yyyy format is superior, etc…
A4 is superior too.
(Yes US doesn’t use A4 paper.)
The superiority of ISO paper sizes isn’t obvious at all if you don’t know how US paper is different. Seems like different countries just use different sizes. But as anyone accustomed to using A- or B-series papers knows, A4 is made of exactly 2 A5s, and the pattern holds up to A10 and down to A0, whereas the US paper sizes are completely unrelated to each other.
So good!
dd.mm.yyyy
I believe in ISO 8601 supremacy
(I’m not saying its not better than American one thougn)
I have for years named files that have a chronological component ymd , and if hours are relevant, hm. A few ymdhm.
Makes a lot of sense when ordering directories.
Edit: and the file name after that. Wouldn’t be useful without descriptive text.
2026-04-13 rule
This is the way.
One of my favourite examples of this is road sign lettering.
Instead of just using the same style as Europe.
They created their own, which caused its own problems.
Then created a replacement, which didn’t help.
too lazy to learn.
12 hour time is a scam created by clockmakers who wanted to save paint.
Hard mode: set time zone to UTC (or Reykjavik; it’s the same) and force yourself to add/subtract offset hours every time you want to know local time. Also, this forces you to track when exactly daylight saving time starts and stops.
Benefit: you know when space probe stuff happens because they’re almost always timestamped UTC. Also, playing Eve Online becomes slightly easier.
In the UK we all (generally) read 24 hour but speak in 12 hour. So we see 15:00 but say 3. Only military peeps talk on 24, and it can sound weird, but people can easily understand them as long as they can parse the who “-hundred” thing (15:00 being fifteen-hundred)
Bulgarian here, same story. 24 hour removes the ambiguity in written form without the need for a suffix, 12 hour is shorter in speech and 99% of the time it doesn’t need specifying because the AM/PM is evident from the context.
In Denmark it’s always written in 24hr, but I’d say it’s 50/50 whether we say 3 or 15 for 15:00.
I guess saying 3 is more casual. But we never use “hundred”. 15:30 would just be fifteen-thirty.
Dutchie here, same for me. In English it’s easy to say 3pm or 9pm but in Dutch that would be 3 uur 's middags (in the afternoon) or 9 uur 's avonds (in the evening) so 15 uur and 21 uur is shorter to say. However, when it’s “am” I always say 's nachts (at night) or 's ochtends (in the morning) to avoid confusion. But all digital clocks in NL are on 24h. I don’t think I’ve seen anyone with a 12h notation on their phone or anything else. It’s such a standard, I don’t even think my oven and microwave have a 12h notation option.
I think it’s just a case of uneducated ignorant Americans stuck in the past, while also having no clue there exists a rest of the world where people are not weird. Like with their imperial system and IALA buoys system (for the entire American continents by the way).
It is similar in Germany. Often with the word Uhr (like o’clock in english) added.
“3 Uhr” or “15 Uhr 30”
Yep, though we also have “Klokken halv 4” which is especially confusing for foreigners
I don’t speak the language, but this looks like it would literally translate to something like “half of the fourth hour” which in English we might say as “half past three”. Kind of interesting that we might say “quarter to four” to mean 3:45, but never “half til four” to mean 3:30.
Yup, it is just half an hour before, very commonly used here. There’s some other English language (Australian?) where it means the opposite - totally not confusing.
We also use quarter to/quarter past as well of course
There are several industries that run on 24 hour time outside of the military. Ocean shipping, aviation, and medical care off the top of my head. Want to throw a real wrench in the works? Start figuring Zulu time, especially when time changes happen at different times of the year in different countries or US states that don’t change at all.
Anyway, 24 hour time is so much easier. No making mistakes forgetting to select AM/PM when setting an alarm or reminder, for instance. Even converting it to 12 hour time takes no thought at all of you use it for a while.
24hr analog watches are the real shit, though!
Had a good emulated one on my phone homescreen for a long time, but unfortunately app is not supported by newer versions of Android any more… :-(
Wow, never knew that was a thing
Are you talking about a watch with 24 different numbers on it?
Are you talking about a watch with 24 different numbers on it?
Yes, arranged in a circle, 24 at the top, 12 at the bottom, lower part is day, upper part is night.
App also had a daylight indication shading depending on local sunrise/sunset.
Loved it!
I’ve been thinking for a while about getting a slow watch, a 24-hour watch that only has an hour hand
l like the idea, but I suspect it often might have the opposite effect as intended.
Imagine e.g. taking a quick glance at the watch to determine if you will still catch the bus - this would most likely result in you sprinting to the bus stop just to be on the safe side…
Only in America do they judge people for using the 24hr clock. Most of the rest of the world uses it. https://worldpopulationreview.com/country-rankings/what-countries-use-24-hour-time
Looking at how the clock in Windows defaults based on region, it seems to be mostly the Whiter of the former British colonies plus a few South American countries that use 12h (for computing, at least). The rest of the world are all 24h.
Listen, it’s easier, especially when you work with scientific or industrial systems
I just don’t understand what pm and am mean:(
I can never get 12PM and 12AM right.
After morning and previous morning
After morning, Past midday, or is it the other way around? 😅
For me it’s After Midnight and Pefore Midnight. 😄 I have no idea which one is 12PM and which one is 12AM, though…
Post meridian and ante meridian.
My sleep schedule is shit. I set everything to 24 hours so that I don’t wake up at 8 PM and think that I’m late for my work at 8 AM.
I started because I used to follow a 28-hour day and would wake up at 6:30, look out the window, and wonder “Which 6:30 though?”
Smash cut to me in college, freaking out, and rushing across campus because I woke up late for my final, and then wondering why it was so dark at 3:30 PM. Even better was when I later actually slept through my final.
I used to work in radio, and we kept our logs in 24h time.
