Velocipede RiderSep 24, 2025

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

Show threadVelocipede RiderSep 24, 2025
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. 😉
Show threadTrammell HudsonSep 24, 2025
@ruari the GTFS spec uses this for transit system https://developers.google.com/transit/gtfs/reference
Show threadVelocipede Rider
@th Nice, thanks for that. Yeah I am formally adopting this myself now. 😜
Sep 24, 2025 at 12:11pmWeb
Show threadVelocipede RiderSep 24, 2025
@th Now I kinda wish I had post quoting. I might update this thread and try and post quote you in the future (if you do not mind of course!). 😉
Show threadVelocipede RiderSep 24, 2025

@th Ok, I did the best I could with the tools I have got. 🤷

I wanted to have this in the thread itself so more would find/notice it.

https://velocipederider.com/@ruari/115259234918239822

Velocipede Rider (@[email protected])

Attached: 1 image A nice comment/observation from @[email protected] https://social.v.st/@th/115259199472957368 "@ruari the GTFS spec uses this for transit system https://developers.google.com/transit/ "

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