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.