Top 50 How Many Hours Is 10Am To 12Am 27655 People Liked This Answer

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How many hours AM to PM?

the 12 Hours running from Midnight to Noon (the AM hours), and. the other 12 Hours running from Noon to Midnight (the PM hours).

How many hours is 12 00 pm?

12-hour clock

12-hour	24-hour
1:00 a.m.	01:00
11:00 a.m.	11:00
11:59 a.m.	11:59
Noon 12 noon 12:00 p.m.	12:00

Is 12am the morning?

Midday and midnight conventions

There are no standards established for the meaning of 12am and 12pm. It is often said that 12am Monday is midnight on Monday morning and 12pm is midday. This puts all the times beginning with 12 and ending with am in the same one-hour block, similarly with those ending with pm.

Is 10 pm morning or night?

In the 12 hour system 10 o’clock morning is represented as 10 A.M. In the 12 hour system 10 o’clock evening is represented as 10 P.M. In the 24 hours system, 10 o’clock in the morning is represented as 10:00 whereas 10 o’clock in the evening is represented as 22:00.

How do I calculate my hours?

Take your number of minutes and divide by 60.

Take your number of minutes and divide by 60. In this example your partial hour is 15 minutes: …
Add your whole hours back in to get 41.25 hours. So 41 hours, 15 minutes equals 41.25 hours.
Multiply your rate of pay by decimal hours to get your total pay before taxes.

How do we calculate time?

The formula for time is given as [Time = Distance ÷ Speed].

How do you calculate work hours?

Follow these steps to calculate worked hours:

Determine the start and the end time. …
Convert the time to military time (24 hours) …
Transform the minutes in decimals. …
Subtract the start time from the end time. …
Subtract the unpaid time taken for breaks.

What time is morning am or PM?

The 12-hour clock method defines all 24 hours of the day using the numbers 1 to 12, followed by am or pm. 5 AM is early in the morning and 5 PM is late in the afternoon; 1 AM is one hour after midnight, and 11 PM is one hour before midnight.

Is it 2pm or 2 pm?

In addition, when writing the times 1:00 pm, 2:00 pm, etc., it is perfectly acceptable to omit the zeroes and write 1 pm, 2 pm, instead.

What’s 12am in 24-hour time?

24-hour clock

24-hour clock	12-hour clock
00:00	12:00 (midnight) 12:00 a.m. (start of the day)
01:00	1:00 a.m.
02:00	2:00 a.m.
…	…

What means am and pm?

Yup, the abbreviation a.m. is short for the Latin ante meridiem, meaning “before noon,” which refers to the period from midnight until noon. And, p.m. then? It’s short for the Latin phrase post merīdiem meaning “after noon.” Got it. One minute after noon is 12:01 p.m.

GRIEZII – 12AM

The Time – Converting AM/PM to 24 Hour Clock

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Showing the Time

Converting AMPM to 24 Hour Clock

Converting 24 Hour Clock to AMPM

Comparison Chart

Midnight and Noon

What Day is Midnight

The Time – Converting AM/PM to 24 Hour Clock

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Table of Contents:

Contents

History and use[edit]

Abbreviations[edit]

Related conventions[edit]

Confusion at noon and midnight[edit]

In literature[edit]

Converting AM/PM to 24 Hour Clock

Time – AM/PM vs 24 Hour Clock

Normally time is shown as Hours:Minutes

There are 24 Hours in a Day and 60 Minutes in each Hour.

Example: 10:25 means 10 Hours and 25 Minutes

Showing the Time

There are two main ways to show the time: “24 Hour Clock” or “AM/PM”:

24 Hour Clock: the time is shown as how many hours and minutes since midnight.

AM/PM (or “12 Hour Clock”): the day is split into: the 12 Hours running from Midnight to Noon (the AM hours), and

hours), and the other 12 Hours running from Noon to Midnight (the PM hours). (or “12 Hour Clock”): the day is split into:

Like this (try the slider):

measure/images/time-am-pm.js

AM PM Ante Meridiem*

Latin for “before midday” Post Meridiem*

Latin for “after midday” Midnight to Noon Noon to Midnight 24 Hour:

00:00 to 11:59 24 Hour:

12:00 to 23:59

*Is that spelled “Meridiem” or “Meridian”? See here.

Converting AM/PM to 24 Hour Clock

Add 12 to any hour after Noon (and subtract 12 for the first hour of the day):

For the first hour of the day (12 Midnight to 12:59 AM), subtract 12 Hours

Examples: 12 Midnight = 00:00, 12:35 AM = 00:35

From 1:00 AM to 12:59 PM, no change

Examples: 11:20 AM = 11:20, 12:30 PM = 12:30

From 1:00 PM to 11:59 PM, add 12 Hours

Examples: 4:45 PM = 16:45, 11:50 PM = 23:50

Converting 24 Hour Clock to AM/PM

For the first hour of the day (00:00 to 00:59), add 12 Hours, make it “AM”

Examples: 00:10 = 12:10 AM, 00:40 = 12:40 AM

From 01:00 to 11:59, just make it “AM”

Examples: 01:15 = 1:15 AM, 11:25 = 11:25 AM

From 12:00 to 12:59, just make it “PM”

Examples: 12:10 = 12:10 PM, 12:55 = 12:55 PM

From 13:00 to 23:59, subtract 12 Hours, make it “PM”

Examples: 14:55 = 2:55 PM, 23:30 = 11:30 PM

Comparison Chart

Here is a side-by-side comparison of the 24 Hour Clock and AM/PM:

Example: on the hour

Example: 10 minutes past 24 Hour Clock AM / PM

24 Hour Clock AM / PM 00:00 12 Midnight

00:10 12:10 AM 01:00 1:00 AM 01:10 1:10 AM 02:00 2:00 AM 02:10 2:10 AM 03:00 3:00 AM 03:10 3:10 AM 04:00 4:00 AM 04:10 4:10 AM 05:00 5:00 AM 05:10 5:10 AM 06:00 6:00 AM 06:10 6:10 AM 07:00 7:00 AM 07:10 7:10 AM 08:00 8:00 AM 08:10 8:10 AM 09:00 9:00 AM 09:10 9:10 AM 10:00 10:00 AM 10:10 10:10 AM 11:00 11:00 AM 11:10 11:10 AM 12:00 12 Noon 12:10 12:10 PM 13:00 1:00 PM 13:10 1:10 PM 14:00 2:00 PM 14:10 2:10 PM 15:00 3:00 PM 15:10 3:10 PM 16:00 4:00 PM 16:10 4:10 PM 17:00 5:00 PM 17:10 5:10 PM 18:00 6:00 PM 18:10 6:10 PM 19:00 7:00 PM 19:10 7:10 PM 20:00 8:00 PM 20:10 8:10 PM 21:00 9:00 PM 21:10 9:10 PM 22:00 10:00 PM 22:10 10:10 PM 23:00 11:00 PM 23:10 11:10 PM

Midnight and Noon

“12 AM” and “12 PM” can cause confusion, so we prefer “12 Midnight” and “12 Noon”.

What Day is Midnight?

Midnight has another problem: there is nothing to tell us “is this the beginning or ending of the day”.

Imagine your friends say they are leaving for holiday at “midnight” on 12th March, what day should you arrive to say goodbye? Do you get there on the 11th (assuming they leave at the very start of the 12th), or the 12th (assuming they leave at the end of the 12th)? It is better to use: 11:59 PM or 12:01 AM, or

23:59 or 00:01 (24-Hour Clock) which the railroads, airlines and military actually do.

So, when you see something like “offer ends midnight October 15th” tell them to use one minute before or after so there is no confusion!

Footnote on “Meridiem” vs “Meridian” Should “AM” be “ante meridiem” or “ante meridian” (likewise for PM)? The official (according to an American, Australian and British dictionary), and most common, spelling for AM is “ante meridiem” which is a Latin phrase. I recommend that spelling! But people sometimes use the phrase “ante meridian” (a “meridian” in this case refers to an imaginary line in the sky when the sun is at its highest point).

3698, 3699, 3700, 3701, 3702, 3703, 3704, 3705, 3658, 3660

12-hour clock

Time counting system

“AM and PM” redirects here. For other uses, see AM PM

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 Latin post meridiem, translating to “after midday”).[1][2] Each period consists of 12 hours numbered: 12 (acting as 0),[3] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11.

The daily cycle starts at 12 midnight, runs through 12 noon, and continues until just before midnight at the end of the day. There is no widely accepted convention for how midday and midnight should be represented. The 12-hour clock was developed from the second millennium BC and reached its modern form in the 16th century AD.

The 12-hour time convention is common in several English-speaking nations and former British colonies, as well as a few other countries.

History and use [ edit ]
The natural day-and-night division of a calendar day forms the fundamental basis as to why each day is split into two cycles. Originally there were two cycles: one cycle which could be tracked by the position of the Sun (day), followed by one cycle which could be tracked by the Moon and stars (night). This eventually evolved into the two 12-hour periods which are used today, one called “a.m.” starting at midnight and another called “p.m.” starting at noon. Noon itself is rarely abbreviated today; but if it is, it is denoted “m.”[1]
The 12-hour clock can be traced back as far as Mesopotamia and ancient Egypt.[4] Both an Egyptian sundial for daytime use[5] and an Egyptian water clock for night-time use were found in the tomb of Pharaoh Amenhotep I.[6] Dating to c. 1500 BC, these clocks divided their respective times of use into 12 hours each.

The Romans also used a 12-hour clock: daylight was divided into 12 equal hours (thus hours having varying length throughout the year) and the night was divided into four watches.

The first mechanical clocks in the 14th century, if they had dials at all, showed all 24 hours using the 24-hour analog dial, influenced by astronomers’ familiarity with the astrolabe and sundial and by their desire to model the Earth’s apparent motion around the Sun. In Northern Europe these dials generally used the 12-hour numbering scheme in Roman numerals but showed both a.m. and p.m. periods in sequence. This is known as the double-XII system and can be seen on many surviving clock faces, such as those at Wells and Exeter.

Elsewhere in Europe, numbering was more likely to be based on the 24-hour system (I to XXIV). The 12-hour clock was used throughout the British empire.

During the 15th and 16th centuries, the 12-hour analog dial and time system gradually became established as standard throughout Northern Europe for general public use. The 24-hour analog dial was reserved for more specialized applications, such as astronomical clocks and chronometers.

Most analog clocks and watches today use the 12-hour dial, on which the shorter hour hand rotates once every 12 hours and twice in one day. Some analog clock dials have an inner ring of numbers along with the standard 1-to-12 numbered ring. The number 12 is paired either with a 00 or a 24, while the numbers 1 through 11 are paired with the numbers 13 through 23, respectively. This modification allows the clock to also be read in 24-hour notation. This kind of 12-hour clock can be found in countries where the 24-hour clock is preferred.

Use by country [ edit ]
In several countries the 12-hour clock is the dominant written and spoken system of time, predominantly in nations that were part of the former British Empire, for example, the United Kingdom, Republic of Ireland, the United States, Canada (excluding Quebec), Australia, New Zealand, South Africa, India, Pakistan, and Bangladesh,and others follow this convention as well, such as Mexico and the former American colony of the Philippines. In most countries, however, the 24-hour clock is the standard system used, especially in writing. Some nations in Europe and Latin America use a combination of the two, preferring the 12-hour system in colloquial speech but using the 24-hour system in written form and in formal contexts.

The 12-hour clock in speech often uses phrases such as … in the morning, … in the afternoon, … in the evening, and …at night. Rider’s British Merlin almanac for 1795 and a similar almanac for 1773 published in London used them.[7] Other than in English-speaking countries and some Spanish-speaking countries, the terms a.m. and p.m. are seldom used and often unknown.

Computer support [ edit ]
In most countries, computers by default show the time in 24-hour notation. Most operating systems, including Microsoft Windows and Unix-like systems such as Linux and macOS, activate the 12-hour notation by default for a limited number of language and region settings. This behaviour can be changed by the user, such as with the Windows operating system’s “Region and Language” settings.[8]
Abbreviations [ edit ]
p.m. with a dot to the left of the hour Typical digital 12-hour alarm clock indicatingwith a dot to the left of the hour

The Latin abbreviations a.m. and p.m. (often written “am” and “pm”, “AM” and “PM”, or “A.M.” and “P.M.”) are used in English and Spanish.[9] The equivalents in Greek are π.μ. and μ.μ., respectively, and in Sinhala පෙ.ව. (pe.va.) for පෙරවරු (peravaru, පෙර pera – fore, pre) and ප.ව. (pa.va.) for පස්වරු (pasvaru, පස්සේ passē – after, post). However, noon is rarely abbreviated in any of these languages, noon normally being written in full. In Portuguese, there are two official options and many others used, for example, using 21:45, 21h45 or 21h45min (official ones) or 21:45 or 9:45 p.m. In Irish, a.m. and i.n. are used, standing for ar maidin (“in the morning”) and iarnóin (“afternoon”) respectively.

Most other languages lack formal abbreviations for “before noon” and “after noon”, and their users use the 12-hour clock only orally and informally.[citation needed] However, in many languages, such as Russian and Hebrew, informal designations are used, such as “9 in the morning” or “3 in the night”.

When abbreviations and phrases are omitted, one may rely on sentence context and societal norms to reduce ambiguity. For example, if one commutes to work at “9:00”, 9:00 a.m. may be implied, but if a social dance is scheduled to begin at “9:00”, it may begin at 9:00 p.m.

Related conventions [ edit ]
Typography [ edit ]
The terms “a.m.” and “p.m.” are abbreviations of the Latin ante meridiem (before midday) and post meridiem (after midday). Depending on the style guide referenced, the abbreviations “a.m.” and “p.m.” are variously written in small capitals (“am” and ” pm”),[citation needed] uppercase letters without a period (“AM” and “PM”), uppercase letters with periods, or lowercase letters (“am” and “pm” or,[10] “a.m.” and “p.m.”).[citation needed] With the advent of computer generated and printed schedules, especially airlines, the “M” character is often omitted as providing no additional information as in “9:30A” or “10:00P”.[citation needed]
Some style guides suggest the use of a space between the number and the a.m. or p.m. abbreviation.[citation needed] Style guides recommend not using a.m. and p.m. without a time preceding it.[11]
The hour/minute separator varies between countries: some use a colon, others use a period (full stop),[10] and still others use the letter h.[citation needed] (In some usages, particularly “military time”, of the 24-hour clock, there is no separator between hours and minutes.[12] This style is not generally seen when the 12-hour clock is used.)

Encoding [ edit ]
Unicode specifies codepoints for “a.m.” and “p.m.” symbols, which are intended to be used only with Chinese-Japanese-Korean (CJK) character sets, as they take up exactly the same space as one CJK character:

U+ 33C2 ㏂ SQUARE AM

U+ 33D8 ㏘ SQUARE PM

Informal speech and rounding off [ edit ]
In speaking, it is common to round the time to the nearest five minutes and/or express the time as the past (or to) the closest hour; for example, “five past five” (5:05). Minutes past the hour means those minutes are added to the hour; “ten past five” means 5:10. Minutes to, ’til and of the hour mean those minutes are subtracted; “ten of five”, “ten ’til five”, and “ten to five” all mean 4:50.

Fifteen minutes is often called a quarter hour, and thirty minutes is often known as a half hour. For example, 5:15 can be phrased “(a) quarter past five” or “five-fifteen”; 5:30 can be “half past five”, “five-thirty” or simply “half five”. The time 8:45 may be spoken as “eight forty-five” or “(a) quarter to nine”.[13]
In older English, it was common for the number 25 to be expressed as “five-and-twenty”.[14] In this way the time 8:35 may be phrased as “five-and-twenty to 9”,[15] although this styling fell out of fashion in the later part of the 1900s and is now rarely used.[16]
Instead of meaning 5:30, the “half five” expression is sometimes used to mean 4:30, or “half-way to five”, especially for regions such as the American Midwest and other areas that have been particularly influenced by German culture. This meaning follows the pattern choices of many Germanic and Slavic languages, including Serbo-Croatian, Dutch, Danish, Russian and Swedish, as well as Hungarian and Finnish.

Moreover, in situations where the relevant hour is obvious or has been recently mentioned, a speaker might omit the hour and just say “quarter to (the hour)”, “half past” or “ten ’til” to avoid an elaborate sentence in informal conversations. These forms are often commonly used in television and radio broadcasts that cover multiple time zones at one-hour intervals.[17]
In describing a vague time of day, a speaker might say the phrase “seven-thirty, eight” to mean sometime around 7:30 or 8:00. Such phrasing can be misinterpreted for a specific time of day (here 7:38), especially by a listener not expecting an estimation. The phrase “about seven-thirty or eight” clarifies this.

Some more ambiguous phrasing might be avoided. Within five minutes of the hour, the phrase “five of seven” (6:55) can be heard “five-oh-seven” (5:07). “Five to seven” or even “six fifty-five” clarifies this.

Formal speech and times to the minute [ edit ]
“O’clock” redirects here. For the o’clock watch, see O bag

Minutes may be expressed as an exact number of minutes past the hour specifying the time of day (e.g., 6:32 p.m. is “six thirty-two”). Additionally, when expressing the time using the “past (after)” or “to (before)” formula, it is conventional to choose the number of minutes below 30 (e.g., 6:32 p.m. is conventionally “twenty-eight minutes to seven” rather than “thirty-two minutes past six”).

In spoken English, full hours are often represented by the numbered hour followed by o’clock (10:00 as ten o’clock, 2:00 as two o’clock). This may be followed by the “a.m.” or “p.m.” designator, though some phrases such as in the morning, in the afternoon, in the evening, or at night more commonly follow analog-style terms such as o’clock, half past three, and quarter to four. O’clock itself may be omitted, telling a time as four a.m. or four p.m. Minutes “:01” to “:09” are usually pronounced as oh one to oh nine (nought or zero can also be used instead of oh). Minutes “:10” to “:59” are pronounced as their usual number-words. For instance, 6:02 a.m. can be pronounced six oh two a.m. whereas 6:32 a.m. could be told as six thirty-two a.m.

Confusion at noon and midnight [ edit ]
It is not always clear what times “12:00 a.m.” and “12:00 p.m.” denote. From the Latin words meridies (midday), ante (before) and post (after), the term ante meridiem (a.m.) means before midday and post meridiem (p.m.) means after midday. Since “noon” (midday, meridies (m.)) is neither before nor after itself, the terms a.m. and p.m. do not apply.[2] Although “12 m.” was suggested as a way to indicate noon, this is seldom done[23] and also does not resolve the question of how to indicate midnight.

The American Heritage Dictionary of the English Language states “By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight.”[27]
E. G. Richards in his book Mapping Time provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight.[28]
The style manual of the United States Government Printing Office used 12 a.m. for noon and 12 p.m. for midnight until its 2008 edition, when it reversed these designations[19][20] and then retained that change in its 2016 revision.[29]
Many U.S. style guides, and NIST’s “Frequently asked questions (FAQ)” web page,[2] recommend that it is clearest if one refers to “noon” or “12:00 noon” and “midnight” or “12:00 midnight” (rather than to “12:00 p.m.” and “12:00 a.m.”). The NIST website states that “12 a.m. and 12 p.m. are ambiguous and should not be used.”

The Associated Press Stylebook specifies that midnight “is part of the day that is ending, not the one that is beginning.”[26]
The Canadian Press Stylebook[24] says, “write noon or midnight, not 12 noon or 12 midnight.” Phrases such as “12 a.m.” and “12 p.m.” are not mentioned at all. Britain’s National Physical Laboratory “FAQ-Time” web page[25] states “In cases where the context cannot be relied upon to place a particular event, the pair of days straddling midnight can be quoted”; also “the terms 12 a.m. and 12 p.m. should be avoided.”

Likewise, some U.S. style guides recommend either clarifying “midnight” with other context clues, such as specifying the two dates between which it falls, or not referring to the term at all. For an example of the latter method, “midnight” is replaced with “11:59 p.m.” for the end of a day or “12:01 a.m.” for the start of a day. That has become common in the United States in legal contracts and for airplane, bus, or train schedules, though some schedules use other conventions. Occasionally, when trains run at regular intervals, the pattern may be broken at midnight by displacing the midnight departure one or more minutes, such as to 11:59 p.m. or 12:01 a.m.[30]
In Japanese usage, midnight is written as 午前0時 (0:00 a.m.) and noon is written as 午後0時 (0:00 p.m.), making the hours numbered sequentially from 0 to 11 in both halves of the day.

In literature [ edit ]
In the George Orwell novel Nineteen Eighty-Four, Winston Smith describes a twelve-hour clock as “old-fashioned”.[31]
See also [ edit ]

Is midnight 12pm or 12am?

NOOKS AND CRANNIES

Is midnight 12pm or 12am? EITHER, since it is both 12 hours before and after noon. The real question is: what is mid-day? John Hawthorne, Crawley, W Sussex. MIDNIGHT is 12pm. One must recognise the difference between points in time and periods of time. Midnight is the zero point in time when we start to build up 24 one-hour periods of time to make up a new day. So midnight is the point 0am. After a period of one hour we reach the point in time called 1am, and after 12 periods of one hour we reach the point called noon. At noon the 13th one-hour period starts, ending at point 1pm. This process continues up to the point 11pm when the 24th period of one hour starts. This period ends in the middle of the night, 12 hours after noon at the point midnight or 12pm. Geoff Berriman, Sandal, Wakefield. WHEN I was in the RAF 50 years ago this problem was solved by defining it out of existence. Working on the 24-hour clock meant that there was no difficulty with midday – 1200 hours – but the Air Force could not countenance 0000 hours for midnight. We were instructed that the Air Force day began at 0001 hours and ended at 2359 hours. The two minutes between were ours to use as we liked. James Eedle, Black Hill, Victoria, Australia. AS IS clear from consideration of the literal meanings of am and pm, noon is 12m, while 12am and 12pm have equal claims on midnight. We tend to avoid 12m nowadays from fear that someone may think m stands for midnight, but in avoiding this confusion we have been thrown into worse confusion by trying to determine which of 12am and 12pm to assign to noon and midnight. Ron Knight Chapel Hill, North Carolina, USA. EXACTLY one hour after 11 Post Meridiem comes 12 Post Meridiem. As it is dark then, I’ve always supposed it is midnight. Denis Buckley, Darwin, Australia. NEITHER, in the strict meaning of the words. But one minute after midnight (12.01) is unquestionably am. Hence for consistent usage, 12am must mean midnight. Adrian Pollock, Yardley, Pennsylvania. GEOFF BERRIMAN may be technically correct (which doesn’t mean I’m agreeing with his strange theory), but in the real world he is wrong. Regardless of thoughts about points in time, 12.01, just after midnight is most definitely, and unarguably 12.01am. 12.01 just after noon is similarly 12.01pm. Also, an event that starts at 11.00pm and goes on until 11.01am has lasted over 12 hours, whereas an event that starts at 11.00pm and goes on until 11.01pm has lasted just one minute. This means that a meeting that starts at 12.00pm and goes on until 12.01pm must have lasted one minute (the alternative would give computer systems worldwide a bigger problem than the millennium bug). Therefore, 12.00pm must be at noon. QED. (Try booking some meetings, lunches etc at 12.00am and see the result.) Phil Benjamin, Enfield, Middx. WHEN I was in the RAF 50 years ago, this problem was solved by defining it out of existence. Working on the 24-hour clock meant that there was no difficulty with midday1200 hours – but the Air Force could not countenance 0000 hours for midnight. We were instructed that the Air Force day began at 0001 hours and ended at 2359 hours. The two minutes between were ours to use as we liked. James Eedle, Black Hill, Victoria, Australia. I am appaled at the rubbish I have read on this subject. There is no genuine confusion nor ambiguity only a self-made one. As the day begins at midnight, midnight must be 12am. The moment of noon is in the first second, consequently minute and hour of the afternoon therefore noon must be 12pm. It is poppycock to say that 12am and 12pm do not exist by considering the moments of noon and midnight within their own right – once the measures they belong to become clear, any supposed confusion vanishes. Mr Graham J Mayer, Epsom England Further to my previous comments, I am DISGUSTED at the ignorant statements that midnight has equal claims on AM and PM – HOW CAN MIDNIGHT BE PM OF A DAY TO WHICH IT DOES NOT BELONG – it MUST be 12am as it clearly belongs to a NEW day – the fact that the hour changes from ll.59pm (one minute before midnight) to 12.00 proves that the new hour must be either still in the same day or the new day – it MUST be the first hour of the new day, the previous day finishing at 11.59pm. in hour/minute language and ll.59.59pm in hour/minute/second language. Mr Graham James Mayer, Epsom England Further to my previous comments, I am DISGUSTED at the ignorant statements that midnight has equal claims on AM and PM – HOW CAN MIDNIGHT BE PM OF A DAY TO WHICH IT DOES NOT BELONG – it MUST be 12am as it clearly belongs to a NEW day – the fact that the hour changes from ll.59pm (one minute before midnight) to 12.00 proves that the new hour must be either still in the same day or the new day – it MUST be the first hour of the new day, the previous day finishing at 11.59pm. In hour/minute language and ll.59.59pm in hour/minute/second language. Mr Graham James Mayer, Epsom, England What a load of nonsense! 12am and 12pm are both mathmatically and logically inadmissable. 12 noon and 12 midnight are the only true values. However, for those who must use this notation, take a look at your digital clock dislay (12hr). When it changes to 12 noon it shows 12pm! And at midnight 12am! So for you freaks that must use an ambiguous notation surely this is the very thing. ie 12pm = noon 12am = midnight Bob Fisher, Rainham, Kent 12am and 12pm are both incorrect. Neither should be used. You should really pay attention to the abbreviation. “a.m.” means “ante meridiem” which means “before midday” and p.m. means “post meridiem”, which means “after midday”. Consequently to use am/pm to refer to midday, (12noon) is simply wrong (and similarly midnight). The correct terms are 12 noon and 12 midnight, with times in between using am/pm. Colin Jones, Aberdeen, Scotland If midnight is 12am (‘ANTE’= before ‘MERIDIEM’= noon), then it follows logically that 1 hour later should be 11am, 2 hours later should be 10am, etc. Our current 11am would be 1am, closely followed by noon which would be 0am or 0pm (either – think ‘noon’ as in ‘none’*). 1pm, 2pm, etc would be as now. Midnight would be 12am or 12pm (either). By counting forwards then backwards in time, we might stop getting older. *Actually ‘noon’ comes from ‘nine’ see www.etymonline.com 😀 Phil Swallow, Lydbrook UK 12:00 is noon 24:00 is midnight John henschel, Surrey B.C. Canada WELL DONE! Absolutely the correct answer from Colin Jones, Aberdeen, Scotland. Why are poeple SO LAZY or ignorant that they need to avoid the use of ‘noon or midday’ and ‘midnight’ as CLEAR descriptions of time. Midnight needing to be qualified further as the end or beginning of a particular day. Worldwide adoption of 00.00 and 24.00 would help enormously! Stanley Sutcliffe, Halifax United Kingdom If we use the military time as our basis for this argument and for the sake of argument say that 2400 is midnight then we can simply answer this question using common sense math skills. Do we start counting at 12 or 24? No we don’t. Do we believe that there is actually a time known as 00:00:00. Most people I know would say that this time does not exist or that doomsday is here if we were on that moment. Therefore the day begins with 00:00:01 (where we naturally start counting from). Using this argument I believe 12 noon to be 12am as it is the end of the morning. 12 midnight is 12pm or the end of the evening. If we take this to be true then we can see that military time as it is known uses 2400 because it is the end of that day and a full 24 hours otherwise why don’t all of our clocks say 00:00:00. Michael Vandiver, Leeds, AL USA Let’s look at a nasty example. My bank sent me a message this week asking me to pay in funds by 12pm on 12th June to avoid charges. I paid in at 3.07pm on 12th June and still got a charge because they say 3.07 pm is after 12pm! I called them and they have waived the charge, but still insist that 12pm is midday. John Griffiths, Norwich Norfolk Both 12am and 12pm are precise moments of time. 12am is the exact moment the 12th hour of the morning finishes (am), and similarly for pm. Therefor 12am is midday and pm would start straight after. The confusion has started since the invention of the digital clock. David Sulivan, Carshalton, Surrey My opinion: Midnight is neither 12pm nor 12am. Why? Well, I think of it this way: Midnight is an exact moment, the border, between the period of time after noon of the day ending (pm) and the period time before noon of the day beginning (am). I think of am and pm as periods of time between midday and midnight and not inclusive of them. An analogy would be the question: Is 5, >5 or <5? Of course it is neither. And though this concept is more obvious for noon, the same is true for midnight. When midnight strikes the digital clock is changing and the display says neither am or pm. So all you night owls, set your meetings for "12 midnight", "00.00" or if you must 12.00.01am. Alec Hendeson, Guildford, UK All this nonsense about using the terms 'mid-day' & 'mid-night' instead of A.M. or P.M is ridiculous. The argument that it is both ante and post midday does not hold. It is only both because you are using two days instead of the specific day you are talking about. 12am Monday is midnight Monday morning. It is A.M. (before mid-day Monday). To argue that it is also P.M (post mid-day) is irrelevant because it is only post mid-day Sunday not Monday. If you say 12am Monday there is no reason to confuse the P.M. of Sunday...this only adds to your confusion and ignorance. alex , Crawley UK My Opinion: 12 can be neither am nor pm. This applies to both 12s. I agree wholeheartedly with Alec Hendeson of Guildford UK and I think his analogy of <5 or >5 is relevant here. Is there an authority on the subject? I would refer readers to http://wwp.greenwichmeantime.com/info/noon.htm Is there a solution to all the confusion and differing opinions? Yes… Do as GMT suggests: Use ‘noon’ and ‘midnight’ or 12:00 and 23:59 & 00:01 instead of 12am/pm. At least there will be no confusion then. Jules Smibert, Gold Coast Australia As we normally count hours numerically adding 1 to the previous hour and as in a normal sequence 12 comes after 11 if it is then 11pm midnight must be 12pm and at the same time 00.00am so 1 minute past midnight is 00.01am the same applies to noon 11am being followed by 12am and at the same time being 00.00pm. Ian Jenks, Ampthill UK Alex, surely you could argue that the day does not start at 24:00? It starts at 00:00:01, which would mean that 12:00 would be 12am and then 24:00 would be 12pm. It depends how you classify a day, if it runs from 00:00:01 until 24:00:00 then 12am is noon and 12pm is midnight. If it runs from 00:00:00 until 23:59:59 then 12am is midnight and 12pm is noon, but surely we all agree 00:00:00 is not a time? Harris Boyle, Coventry UK Of course 00:00:00 is a time, it is one second before 00:00:01. Think how many computer operations could take place unnoticed in that no-man’s land of a whole second second! 12:00pm Sunday night is the same time as 00:00am Monday morning. Just make sure you specify the appropriate day. Rob Corne, Auckland New Zealand Jules Smibert is correct. Midnight and midday are neither am or pm (as explained in the GMT link he provided). Basic calculus explains the concept well (see http://www.themathpage.com/acalc/infinity.htm). As ‘x’ approaches zero it never actually gets there just as it reciprocal never reaches infinity. Gary Reid, Wollongong Australia Midnight is neither 12pm or 12am, there is no such time. Midnight is 12 midnight and mid-day is 12 noon. All other usage is sloppy. As one reply says the armed forces use 23:59 and 00:01 George Redgrave, Crawley United Kingdom The disagreement about midnight stems from the fact that it is a boundary between two days. 24:00:00 Monday and 00:00:00 Tuesday are both correct and both refer to the same moment. There is no reason to prefere one over the other except a desite for standardisation. Following this, it is obvious that this same moment in time can also be called 12pm Monday (because it is 12 hours after the Monday meridian) or 12am Tuesday (because it is 12 hours before the Tuesday meridian). The very fact that both of these positions can be defended is reason to never use either. Similarly, noon is the meridian and is therefor neither am nor pm. We only call it 12 o’clock because of the number on the dial. There is no logical reason why this number cannot be replaced with a zero. Yet Another Geek, I would refer you all to http://www.thaivisa.com/forum/topic/645370-12-am-and-12-pm/ Jim Mills, Phuket Thailand 12 noon can be neither 12 am (in English before noon) nor 12 pm (after noon). It is simply noon. Since we do not notate time backwards, 12 midnight is not 12 am, since it would then require 1 am to become 11 am and so on. Similarly since it is the fleeting instant that marks both the end of one day and the beginning of the next (it belongs to both days and to neither),it is not 12 pm. In reality midnight has no sooner been reached than it has been passed. The phrase “the stroke of midnight” is apt. As has been demonstrated by many of the previous answers, and because it is incorrect, the use of 12 am and 12 pm is inherently confusing. To avoid this confusion it should be ended. The use of noon and midnight informally or 12 noon and 12 midnight or 1200 and 2400 should become practice. Bernard Maguire, Glasgow Scotland I have had fun reading all these answers. However, I have always held the fact that 12pm is noon. Example: Counting in minutes, you would have 10:58am, 10:59am, 11:00am, 11:01am etc. Therefore it stands to reason you would have: 11:58am, 11:59am, 12:00pm, 12:01pm. It would just be odd to have: 11:58am, 11:59am, 12:00am, 12:01pm … e.g. 12:00am for simply 1 millisecond just doesn’t make sense! John Wood, Sheffield, England Use 12 midday or 12 midnight for clarity. In my neck of the woods the usage is actually a logical counting up 9pm to 10pm to 11pm to 12pm ie counting up 12pm is MIDNIGHT 12 am is MIDDAY Fraction of a second do count logically 12 midnight is 12pm 12.00.01 is 12.00.01am It does of course depend on YOUR particular logic. It is easy to call others morons. T Brophy, St Helens UK Actually, Midnight is 12.00 AM (not 12.00 PM). Please read through the Clock System table in the below link: http://en.wikipedia.org/wiki/12-hour_clock Dilli Rajan, Chennai India It is very interesting reading all these comments. We need to realize that a clock gives us a means of reading time. Time is a fluid, always changing value. It is never what the clock says it is. Noon and midnight are for a infinitely small period of time as is any number on the clock represents. An example is the only clock that is correct is the one that is stopped. It gives the correct time twice a day. A running clock is always wrong. By the time we look at a clock that tells us it is noon, it is past noon and the same at midnight. So where does that leave us? When the time reaches noon, it is PM. When the time reaches midnight, it is AM. An analogue clock does not confuse, because our brain knows what it is telling us. The digital world we live in is trying to precise and yet it is not. To try to represent time in a digital way, we must realize that noon and midnight are only words. Our digital clocks should not say 12:00 AM or PM. The need to say midnight or noon. And the same goes for the written time. As one note said, when the clock say 12:00 and you see that it is dark out or, if you have not windows, you remember it was evening the last time to checked, it must be close to midnight not noon. Some common sense needs to be used somewhere in here. I personally will not wear the digital watch, because it gives me the false feeling that it is exact. I have never worn a watch that gives me the exact time. Bob Simons, Cameron, USA By technicality, mid-day and midnight exist for only a fraction of a second. By this assumption any time from 12:00:00:00:00:01 pm, (hour:minute:second:millisecond:microsecond:nanosecond notation) is after mid-day -I can’t be bothered going smaller than that- 12pm, by this definition is “mid-day” Ben Wallace, Wellington, New Zealand

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