12h vs 24h Clock

Users debate the superiority of 24-hour clock format over 12-hour AM/PM in software, highlighting ambiguities like midnight/noon and requesting support for 24h time in a specific tool.

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2,641
Comments
19
Years Active
5
Top Authors
#4285
Topic ID

Activity Over Time

2008
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69
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91
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110
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Keywords

AM A1 US DB MeNomNom PM BTW NOT wikipedia.org clock 00 hour 24 hour 24 pm 12 day hours 3am

Sample Comments

jgrahamc • Nov 12, 2008 • View on HN

Not sure this scales well to 24 hour clock as used almost everywhere but the US.

NeoTar • May 12, 2022 • View on HN

Great argument for using the 24h clock ;-)

naniwaduni • Jan 20, 2021 • View on HN

12-hour timekeeping, perhaps ;-)

jonathancai11 • May 1, 2020 • View on HN

Thanks for the feedback! Totally forgot 24-hr clock was a thing, will add that as a option asap

augustk • Nov 27, 2020 • View on HN

Would be even better with 24-hour clock.

FL410 • Dec 21, 2024 • View on HN

Can we switch to 24h time like sane human beings, too?

zoover2020 • Sep 2, 2025 • View on HN

That's a lot of mental gymnastics to say 24h clock is easier

celadin • Nov 3, 2022 • View on HN

24 hour time at the very least! Down with am/pm!

buggymcbugfix • Sep 1, 2025 • View on HN

One more reason to switch to 24h time? 0:)

lazylizard • Jan 9, 2021 • View on HN

it is. some ppl say 2359 to avoid saying 12am/pm.