So @sotolf reminded me of something I kind of love. The Japanese "30-hour system". Used in nightlife, broadcasting, and transport, the time extends the day past midnight to keep late-night events grouped with the same calendar day. So a club open from 11PM to 1AM might list its hours as 23:00–25:00.

We should all adopt this!

Sadly Wikipedia does not have a detailed page on this system in English but here is a little longer explanation:

https://skdesu.com/en/30-hours-from/

#Japan #30HourClock #TimeTrivia

I was told by a colleague that NASA sometimes use extended hour formats (like 25:00 or 26:00) to keep events grouped on the same operational day. So it is kinda the same as the Japanese 30-hour system. I cannot find a great article on this but if someone knows of one, let me know. 😉

Ok, I did not find an article on extended times (past midnight) from NASA but you can indeed find references that confirm it is a thing they do, e.g. from this page:

https://www.nasa.gov/history/afj/ap15fj/05day2_checking_sps.html

I mean, if it is good enough for both the Japanese and NASA, we really should all do this, right @sotolf ? 😉

@sotolf Then again the Americans are already scared of the 24 hour clock. If we push for the 30 hour notation I think they might lose it altogether.

But… they did give us Trump, so I am not adverse to making them feel a little uncomfortable. 🤷

Here's an idea. Many smartphones and watches have sleep trackers. If your smart device knows you have not slept yet, should it list the time with this 30 hour system?

I mean if you stayed up late and decided to go to a club it might help if your watch used the same notation for closing times as the place you want to get into, right?

Especially if you are a little drunk as it requires less thinking. 🤔

A nice comment/observation from @th

https://social.v.st/@th/115259199472957368

"@ruari the GTFS spec uses this for transit system https://developers.google.com/transit/ "

Something similar was also pointed out to me by @hananc, " In Israel, there is a bus that leaves at midnight and a half. In the timeline it says 24:30 of the previous date so people are not confused which midnight and half it leaves at."

https://tooot.im/@hananc/115259241108692260

חנן כהן • Hanan Cohen (@[email protected])

@[email protected] In Israel, there is a bus that leaves at midnight and a half. In the timeline it says 24:30 of the previous date so people are not confused which midnight and half it leaves at.

Toootim

Another useful comment from @hananc, "it is mentioned in this wikipedia page…"

https://en.wikipedia.org/wiki/24-hour_clock#Times_after_24:00

which in turn also links to

https://en.wikipedia.org/wiki/Date_and_time_notation_in_Japan#Time

24-hour clock - Wikipedia

@ruari @hananc
A new item for "Falsehoods Programmers Believe About Time", I think?

#Times_after_24 #Time

More falsehoods programmers believe about time; "wisdom of the crowd" edition

A couple of days ago I decided to [write down some of the things I've learned about testing][testing_post] over the course of the last [several years.][codeascraft] In the course of enumerating the...

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@hananc @ruari
I think that refers to timekeeping on Mars, and wouldn't cover times from about 24:40 onwards