4 ms·

The "opportunity for bugs" I didn't realize until I was over 10 years into my professional career: 10 AM 11 AM 12 PM <- AM/PM and calendar cycle is here. 01

The "opportunity for bugs" I didn't realize until I was over 10 years into my professional career: 10 AM 11 AM 12 PM <- AM/PM and calendar cycle is here. 01 PM <- n%12 cycle is here, an hour later. 02 PM 03 PM I see large software systems for things like airlines and trains sometimes make this mistake, for instance a 1 hour trip on a ticket that says "11:30AM - 12:30AM" which is actually negative 11 hours. I have a collection of photos somewhere of every time I've caught it. If I could change anything about time that probably nobody would care about, it would be to align those two cycles. The fact that I catch it every couple months on widely deployed systems I interpret as the signal that basically nobody notices/cares about it as everyone knows a -11 hour train ride isn't how time works.

not2b 4y ago
I missed a plane flight once because an admin for the company I was working with booked a midnight flight accidentally and I thought it was at noon (I think she thought so as well). I think it was in the 90s sometime.
- UncleEntity 4y ago
  Not very long ago I showed up to an appointment at 7:00 am and was told it was really at 19:00 — and our computer system uses 24 hour time so obviously someone just screwed up the conversion. Midnight appointment are interesting since the system doesn’t have “no appointment time” so they use 00:00 and 00:01 for a real midnight appointment and if you’re really, really tired…
gsich 4y ago
am/pm users have lost their sanity.
- BonoboIO 4y ago
  I m surprised it’s not 7 inch past 12
BurningFrog 4y ago
As a 1995 immigrant, I understand what am/pm time it is 22 hours of the day, but I'm still not sure about those two 12:* mystery hours. I know, I can look it up, and I have several times. But the knowledge doesn't stick...
- kristopolous 4y ago
  Post median, ante median. Translation: After midpoint, before midpoint. Also the difference in the cycles comes from analog clocks. I can explain all of this but it's still confusing and stupid to have to deal with it in 2022
  - noSyncCloud 4y ago
    Ante/post meridiem, not median https://en.wikipedia.org/wiki/12-hour_clock?wprov=sfla1 https://en.wikipedia.org/wiki/12-hour_clock?wprov=sfla1
  - dekleinewolf 4y ago
    I would argue that 12:30 hours after midpoint is exactly that: there is the midpoint, and then you add 12 hours and 30 minutes. So 12:30 PM would be 00.30 military time according to that logic. As a non-native am/pm user: it's confusing. Even with that rule.
- afiori 4y ago
  You have to look at it as a separate concept from the hh:mm time, pm is between midday (inclusive) and midnight (exclusive) and am the rest, between midnight (inclusive) and midday (exclusive).
  - BurningFrog 4y ago
    Right. When I do remember, that's the rule I use. The ambiguity of midday and midnight is really the cherry on top of this masterpiece of confusion. There is probably some part of me too offended by this system to want to remember it...
jcparkyn 4y ago
> Align those two cycles I'd say that the best solution would be to just rename 12 to 0, which is what it already should have been IMO, regardless of am/pm. I've noticed some digital watches use 0:00AM instead of 12:00AM, but I've never seen this used for 0:00PM.

not2b 4y ago

I missed a plane flight once because an admin for the company I was working with booked a midnight flight accidentally and I thought it was at noon (I think she thought so as well). I think it was in the 90s sometime.

UncleEntity 4y ago
Not very long ago I showed up to an appointment at 7:00 am and was told it was really at 19:00 — and our computer system uses 24 hour time so obviously someone just screwed up the conversion. Midnight appointment are interesting since the system doesn’t have “no appointment time” so they use 00:00 and 00:01 for a real midnight appointment and if you’re really, really tired…

gsich 4y ago

am/pm users have lost their sanity.

BonoboIO 4y ago
I m surprised it’s not 7 inch past 12

BurningFrog 4y ago

As a 1995 immigrant, I understand what am/pm time it is 22 hours of the day, but I'm still not sure about those two 12:* mystery hours. I know, I can look it up, and I have several times. But the knowledge doesn't stick...

kristopolous 4y ago
Post median, ante median. Translation: After midpoint, before midpoint. Also the difference in the cycles comes from analog clocks. I can explain all of this but it's still confusing and stupid to have to deal with it in 2022
- noSyncCloud 4y ago
  Ante/post meridiem, not median https://en.wikipedia.org/wiki/12-hour_clock?wprov=sfla1 https://en.wikipedia.org/wiki/12-hour_clock?wprov=sfla1
- dekleinewolf 4y ago
  I would argue that 12:30 hours after midpoint is exactly that: there is the midpoint, and then you add 12 hours and 30 minutes. So 12:30 PM would be 00.30 military time according to that logic. As a non-native am/pm user: it's confusing. Even with that rule.
afiori 4y ago
You have to look at it as a separate concept from the hh:mm time, pm is between midday (inclusive) and midnight (exclusive) and am the rest, between midnight (inclusive) and midday (exclusive).
- BurningFrog 4y ago
  Right. When I do remember, that's the rule I use. The ambiguity of midday and midnight is really the cherry on top of this masterpiece of confusion. There is probably some part of me too offended by this system to want to remember it...

jcparkyn 4y ago

> Align those two cycles I'd say that the best solution would be to just rename 12 to 0, which is what it already should have been IMO, regardless of am/pm. I've noticed some digital watches use 0:00AM instead of 12:00AM, but I've never seen this used for 0:00PM.