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12 pm, 12 am.

(10 Posts)
GrannyHaddock Sat 22-Jun-19 21:45:24

What is meant by this? 12 o'clock can only be noon or midnight. I see it frequently, where hours of business etc. are listed.

dementedpixie Sat 22-Jun-19 22:02:57


Doyouthinktheysaurus Sat 22-Jun-19 22:07:52

24 hour clock is 00:00 or 12:00 but 12 hour clock, you need to specify am or pm.

I'm a nurse and always document in 24 hour clock but day to day I use am and pm.

FaithInfinity Sat 22-Jun-19 22:08:52

There’s no such time as 12pm or 12am! P.M. means ‘post-meridiem’, and 12 is on the meridiem. It’s a common misunderstanding that I find very annoying! Even the BBC use it now though hmm

dudsville Sat 22-Jun-19 22:11:03

I refer to "12 noon" in written letters. I never need to refer to midnight but I would say this rather than "12pm".

ThinkWittyThoughts Sat 22-Jun-19 22:21:14

My inner pedant wants to be BFF with @FaithInfinity grin

FaithInfinity Sat 22-Jun-19 22:36:14

Ooh friend grin honestly I remember learning about this at school when I was 9. It bothers me more than I can say.
Also while I’m here it’s railway station not train station! angry

JoJoSM2 Sat 22-Jun-19 22:40:58

And anyway 12am should be an hour after 11am, and 12pm an hour after 11pm... People should best just say noon and midnight.

blahblah88 Sat 22-Jun-19 22:51:54

Technically, 12am would be literally one nanosecond after midnight had struck but would still be considered just 12. The same for noon. Time is always counting.

BernadetteRostankowskiWolowitz Sat 22-Jun-19 22:53:59

12am is just before 1am. 12pm is just before 1pm.

But yes, it should be noon and midnight.

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