time counting system, divided into two parts: AM and PM
exeter cathedral astronomical clock
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from … Wikipedia
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Wikipedia
en.wikipedia.org › wiki › 12-hour_clock
12-hour clock - Wikipedia
2 weeks ago - In English-speaking countries: "12 p.m." usually indicates noon, while "12 a.m." means midnight, but the reverse convention has also been used (see § Confusion at noon and midnight). "Noon" and "midnight" are unambiguous. The natural day-and-night division of a calendar day forms the fundamental ...
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Quora
quora.com › What-time-is-12-00-am-night-or-morning
What time is 12:00 am night or morning? - Quora
I avoid using 12:00 AM, because it is actually noon time theoretically, as understood generally. Therefore, 11.59+ AM is the morning/daytime. Additionally, when I say 12.01 PM, it is afternoon.
Discussions

the difference between 12:30am and 12:30pm
It's easy to confuse the 12:00 ... 12 :30 am ( for an example ) is 30 minutes after noon and ok they will arrive the airport at the afternoon and so missing the flight. They should have been been there at early morning( at midnight ) on that day. If we use the system of 24 hours clock is better for all to schedule the trip at any place in the world.. ... Saturday night my son is born after 12:30am which day will considered please tell me Saturday or ... More on preply.com
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December 10, 2020
Is 12 PM at noon? How is that when 11 am is in the morning And 1 am is in the night. Where did the 12 am go?
12pm is noon, 12am is midnight. More on reddit.com
🌐 r/EnglishLearning
156
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October 10, 2024
Is 12:00 AM considered morning or night?
Technically it’s morning. Not even an argument. My answer was purely based on the clock system. But I think the answer is actually a bit more complex depending on your location and time of year. After reading the definitions of Morning, Night, Day, Midnight, and AM/PM, my answer is that 12 AM can be Morning, Morning and Night, or Morning and Day. I do not believe 12 AM can solely be called Night based on the phrasing of your question. It seems like your uncle is conflating Afternoon (PM) and Night (period of time from sunset to sunrise). By definition 12 AM is the start of the morning hours or Ante Meridian. So by the clock system it’s Morning. The definition of Night is the period of time from sunset to sunrise. In many parts of the world during much of the year the sun has set when the clock strikes 12AM. Thus 12 AM is by definition both Night (no sunlight) and Morning (AM). There are parts of the world (think extreme North or extreme South) where the sun does not set for months. In these parts of the world, during these seasons of seemingly unending daylight, 12 AM is both Morning and Day. As Day is defined by the period of time from sunrise to sunset. If you really wanted to split hairs the final scenario that I can think of, is where 12 AM is simultaneously Midnight, Morning, and Night or Midnight, Morning, and Day. Depending on location, season, and the presence or absence of sunlight and the definition of midnight. Just don’t ask if 12 PM is considered Afternoon or Day. More on reddit.com
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March 20, 2020
Is 12:01 AM technically morning?
Go to bed earlier More on reddit.com
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13
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February 5, 2022
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quillbot.com › home › is 12 p.m. afternoon?
Is 12 p.m. afternoon?
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Is 12 p.m. afternoon?
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Royal Museums Greenwich
rmg.co.uk › stories › time › noon-12-am-or-12-pm
Is noon 12 am or 12 pm? | Royal Museums Greenwich
When they say 12am, they normally mean 12 midnight. While some people follow this convention, technically it's not quite right – as you'll see from the definition of am and pm below.
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EnglishClub
englishclub.com › efl › articles › vocabulary › 12am-12pm-whats-the-difference
12am & 12pm – What’s the Difference?! | EnglishClub
We say 12 at midday or midnight as a continuation of the sequence from 1 up to 11, and 12 comes after 11. Hence, if we refer to the mornings and say 1 am to 11 am, then 12 must follow as 12 am (midday); and, if we refer to the afternoons and nights and say 1 pm to 11 pm, then 12 must follow ...
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Preply
preply.com › home › english › the difference between 12:30am and 12:30pm
the difference between 12:30am and 12:30pm | Learn English
Okay so when do we say 12:30 AM? So it's in the first period which begins at midnight. So technically, 12AM and 12:30PM is just afternoon, which technically is 12PM. So to avoid confusion, many people do not use 12AM or 12PM, and prefer to use midnight for 12AM and noon for 12PM.
Published   December 10, 2020
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TimeAndDate
timeanddate.com › time zones › am and pm
AM and PM: What Do They Mean?
Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day. For example, 1 am is one hour after midnight, and 5 am is early in the morning; 5 pm is late in the afternoon, while 11 pm is one ...
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NPL
npl.co.uk › resources › q-a › is-midnight-12am-or-12pm
Midnight - is it 12am or 12pm? - NPL
There are no official standards established for the meaning of 12am and 12pm, but it is generally accepted that 12am means midnight and 12pm means midday. The ‘am’ and ‘pm’ stand for ante meridiem and post meridiem – Latin words meaning ...
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QuillBot
quillbot.com › home › is 12 p.m. afternoon?
Is 12 p.m. afternoon?
December 16, 2024 - 12 p.m. is the start of the afternoon. It is a point in time that is also called “midday” or “noon” and is expressed as 12:00 in 24-hour clock. It comes
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Quora
quora.com › Why-do-we-have-12-00-AM-and-12-00-PM-for-midnight-and-noon-and-what-s-the-correct-way-to-write-them
Why do we have 12:00 AM and 12:00 PM for midnight and noon, and what’s the correct way to write them? - Quora
AM and PM cannot be applied to either noon or midnight. 12 o’ clock in the middle of the day is simply “noon”, and 12 o’ clock in the middle of the night is simply “midnight”. No AM or PM applies or is used.
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Timewatch
timewatch.com › home › am pm explained. is noon 12am or 12pm? why are there 24 hours in a day?
AM PM explained. Is noon 12AM or 12PM? Why are there 24 hours in a day?
October 31, 2025 - One minute before this must be 12:59 and as the sun is definitely before the meridian (ante meridien) in this 12 hour period, it must be 12:59 AM. So, the early hours of the morning are 12:01-12:59AM and midnight is therefore 12:00AM. Yet, is 12:00AM Tuesday midnight on Monday or midnight on Tuesday? Is it night or is it morning?
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Reddit
reddit.com › r/nostupidquestions › is 12:00 am considered morning or night?
r/NoStupidQuestions on Reddit: Is 12:00 AM considered morning or night?
March 20, 2020 -

My uncle and I are arguing about whether 12 AM is considered morning or night. I'm not going to say which side I take so I don't skew the results. Hopefully y'all can solve this argument.

Top answer
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Technically it’s morning. Not even an argument. My answer was purely based on the clock system. But I think the answer is actually a bit more complex depending on your location and time of year. After reading the definitions of Morning, Night, Day, Midnight, and AM/PM, my answer is that 12 AM can be Morning, Morning and Night, or Morning and Day. I do not believe 12 AM can solely be called Night based on the phrasing of your question. It seems like your uncle is conflating Afternoon (PM) and Night (period of time from sunset to sunrise). By definition 12 AM is the start of the morning hours or Ante Meridian. So by the clock system it’s Morning. The definition of Night is the period of time from sunset to sunrise. In many parts of the world during much of the year the sun has set when the clock strikes 12AM. Thus 12 AM is by definition both Night (no sunlight) and Morning (AM). There are parts of the world (think extreme North or extreme South) where the sun does not set for months. In these parts of the world, during these seasons of seemingly unending daylight, 12 AM is both Morning and Day. As Day is defined by the period of time from sunrise to sunset. If you really wanted to split hairs the final scenario that I can think of, is where 12 AM is simultaneously Midnight, Morning, and Night or Midnight, Morning, and Day. Depending on location, season, and the presence or absence of sunlight and the definition of midnight. Just don’t ask if 12 PM is considered Afternoon or Day.
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Is both an option?
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Eileen's Lounge
eileenslounge.com › viewtopic.php
What time is 12 PM - Eileen's Lounge
Since PM means after noon, I guess it's probably midnight, but I'm really not sure because clearly 12 AM would also have to be midnight from the same logic! ... 12 pm is midday (Noon). Think of it this way. 11:59 is that last time of the "morning." So, the next minute (12:00) is the beginning of afternoon. Conversely, 11:59 in the night is the last time of that day.
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Wikipedia
en.wikipedia.org › wiki › Midnight
Midnight - Wikipedia
18 hours ago - The US National Institute of Standards and Technology (NIST) recommends avoiding confusion altogether by using "11:59 pm" or "12:01 am" and the intended date instead of "midnight" or "12:00 am".
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Reddit
reddit.com › r/time › is 12:01 am technically morning?
r/Time on Reddit: Is 12:01 AM technically morning?
February 5, 2022 -

My wife gets on me sometimes because I go to bed at 12:30 or 1 or 1:30 and I say “goodnight” to her and she jokes “well technically it’s morning”. I try to argue that night technically is from sunset to sunrise but she says once the clock hits 12:01 am it’s morning and tells me to look up AM and PM. Help!

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The Guardian
theguardian.com › notesandqueries › query › 0,,-1752,00.html
Is midnight 12pm or 12am? | Notes and Queries | guardian.co.uk
Skip to main content · EITHER, since it is both 12 hours before and after noon. The real question is: what is mid-day
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Quora
quora.com › Is-12pm-noon-or-midnight
Is 12pm noon or midnight? - Quora
Answer (1 of 20): By convention, 12:00 PM is noon while 12:00 AM is midnight. What’s following is purely informative and you can skip it if you only want an direct answer. Outside of the view on a 12 hours clock, this can be confusing for anyone who think to follow the logical numerical sequenc...
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WordReference
forum.wordreference.com › english only › english only
12am / 12pm - Which is noon? which is midnight? | WordReference Forums
June 27, 2012 - During this time people where asleep and it was considered "night" time, so AM time. 11:59 AM ----> 12:00 PM. Again, it is the similar explanation above. People consider the "morning" time has not gone, and it's time for the rest of the day. You may want to use the 24 hour system, if you are confused. 12:00 (Twelve hundred hours) or 00:00/24:00 (oh hundred hours / twenty-four hundred hours).