AM and PM are abbreviations used in the 12-hour clock system to distinguish between the two 12-hour periods in a day.
AM stands for Ante Meridiem, meaning "before midday". It covers the time from 12:00 midnight (00:00) to 11:59 AM, including the early morning hours.
PM stands for Post Meridiem, meaning "after midday". It covers the time from 12:00 noon (12:00) to 11:59 PM, including the afternoon and evening.
Key Points:
12:00 AM = Midnight (start of the day)
12:00 PM = Noon (middle of the day)
Times like 7:00 AM are in the morning; 7:00 PM are in the evening.
To convert from 24-hour to AM/PM format:
Times 00:00 to 11:59 → Use AM (e.g., 08:30 → 8:30 AM).
Times 12:00 to 23:59 → Use PM, subtract 12 from the hour if over 12 (e.g., 19:00 → 7:00 PM).
The 24-hour clock (used in military, aviation, and international contexts) avoids AM/PM confusion by using numbers from 00:00 to 23:59.
Military Time Chart
militarytimechart.com › home
Military Time Chart - The 24 Hour Clock
February 28, 2023 - A usage example showing the 12 hour clock vs military time would be a time table showing 4:00 pm to 12:00 midnight. This would be written as 16:00 – 24:00. Another example highlighting the difference between the two would be to show that 10:15 am is written as 10:15 in military time but 2:30 pm is written as 14:30.
Star Card (Exchange Credit Program/AAFES
The Military Star card (aka the AAFES star card) is a credit card that is exclusively available to military personnel and their families. Read more...
Military Alphabet (Alpha to Zulu
The Modern Military Alphabet: Everything You Wanted to Know, from Alpha to Zulu. Also known as the Army Alphabet, or the NATO Alphabet.
24TimeZones
24timezones.com › world time clock & map
World Clock — current time around the world
3 weeks ago - These abbreviations are used to identify the time in the 12-hour clock format instead of using 24 hours. Considering that day has two cycles, AM and PM denote whether it is before or after the middle of a day.
Videos
08:25
Why Do We Call It AM and PM? The Surprisingly Ancient Reason [ID0801] ...
What is AM and PM ? | Time Made Easy! | AM & PM in Real Life - YouTube
12:59
AM PM time | AM PM time meaning - YouTube
Telling Time to the Minute - AM and PM - YouTube
03:14
Difference between AM and PM - YouTube
02:32
AM & PM Explained Simply | Basic English Time for Beginners - YouTube
How do you convert 24-hour format time to AM and PM?
To convert a 24-hour format to AM/PM:- For times 00:00 to 11:59: Add 'AM' (e.g., 08:30 becomes 8:30 AM).- For times 12:00 to 12:59: Add 'PM' (e.g., 12:45 becomes 12:45 PM).- For times 13:00 to 23:59: Subtract 12 and add 'PM' (e.g., 19:00 becomes 7:00 PM).
vedantu.com
vedantu.com › full form › what is the full form of am and pm?
AM and PM Full Form Explained: Meaning, Difference & Time Tips
What is the use of 24-hour time format compared to AM/PM?
The 24-hour format removes ambiguity by representing each hour uniquely, avoiding confusion between morning and evening times. It is commonly used in railways, military, and international practice, while AM/PM is often used in everyday schedules and academic settings.
vedantu.com
vedantu.com › full form › what is the full form of am and pm?
AM and PM Full Form Explained: Meaning, Difference & Time Tips
What is the difference between AM and PM?
AM covers the time from midnight (12:00 AM) to just before noon (11:59 AM), while PM covers noon (12:00 PM) to just before the next midnight (11:59 PM). This distinction divides the 24-hour day into two 12-hour periods for clear time identification.
vedantu.com
vedantu.com › full form › what is the full form of am and pm?
AM and PM Full Form Explained: Meaning, Difference & Time Tips
AL.com
al.com › sec › 2026 › 03 › 2026-sec-mens-basketball-tournament-bracket-tv-time-schedules.html
2026 SEC men’s basketball tournament bracket, TV time, schedules - al.com
2 weeks ago - Wednesday, March 11 (All games on SEC Network, all times central)
Google Groups
groups.google.com › g › alt.horology › c › Y8nZ7h0nRb8
When does am and pm change?
We do not counting from the start of our period, but only after a period of time has passed do we count 1 and after another period we count 2. This can be continued untill we get to 59. We still have another period to pass before we count one hour. Continue this resoning untill you get to 11:59 and you find that 12:00 is the end of the period that we call AM and the sun is high in the sky. Imediatly thereafter we enter the PM period and it continues untill midnight.
VEDANTU
vedantu.com › full form › what is the full form of am and pm?
AM and PM Full Form Explained: Meaning, Difference & Time Tips
AM (Ante Meridiem) refers to the period from 12:00 midnight (00:00) to 11:59 in the morning. For example, 7:30 AM indicates a time in the morning, seven and a half hours after midnight.
Wikipedia
en.wikipedia.org › wiki › 12-hour_clock
12-hour clock - Wikipedia
1 week ago - The hour/minute separator varies between countries: some use a colon, others use a period (full stop), and still others use the letter h. (In some usages, particularly "military time", of the 24-hour clock, there is no separator between hours and minutes. This style is not generally seen when the 12-hour clock is used.) Unicode specifies codepoints for a.m. and p.m. as precomposed characters, 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 ·
BusinessWritingBlog
businesswritingblog.com › home › how to write time – a.m., p.m., a.m., p.m.
How To Write Time Correctly - BusinessWritingBlog
December 22, 2023 - The Gregg Reference Manual: 4 p.m. or 4 P.M. (with PM in small capitals) Whatever style you choose, be consistent. The author’s preference is to always use lowercase letters: 4 p.m. Omit zeros when the time is on the hour (unless you want ...
TimeTrex
timetrex.com › home › resources › 24 hour military time converter
24 Hour Military Time Converter - TimeTrex
October 31, 2024 - Military time is a timekeeping system that uses a 24-hour clock to represent each hour of the day in a continuous sequence from 0000 to 2359, without using AM or PM designations. Unlike the standard 12-hour clock, which resets twice a day (from 12:00 AM to 11:59 AM, then from 12:00 PM to 11:59 PM), military time follows a single cycle from midnight to midnight.
Examples
examples.com › maths › am pm examples, definition, tools, conversion chart, uses
Am Pm - Examples, Definition, Tools, Conversion Chart, Uses
July 19, 2024 - AM, or “Ante Meridiem,” translates to “before midday” and includes the hours from midnight to noon. Meanwhile, PM, or “Post Meridiem,” means “after midday” and encompasses the hours from noon to midnight.
Timewatch
timewatch.com › home › am pm explained. is noon 12am or 12pm? why are there 24 hours in a day?
When is 12:00AM Tuesday? AM PM Time Format Explained?
October 31, 2025 - There are no real standards for the meaning of 12:00 AM nor 12:00 PM, but there are answers. You may think you know, but are you right? More than 50% of the people we asked were wrong. Confused? Alright. Set your clocks, let’s go. Who are we? Timewatch are specialists in time: planning it, tracking it, analyzing it, reporting on Outlook calendars and more.
TimeAndDate
timeanddate.com › time zones › am and pm
AM and PM: What Do They Mean?
Neither moment can logically be identified as before noon (am) or after noon (pm). For example, the moment of midnight occurs precisely 12 hours after noon on the previous day and 12 hours before noon on the following day.
Encyclopedia Britannica
britannica.com › technology › engineering › mechanical engineering
What Do AM and PM Stand For? | Time, Clock, History, & Facts | Britannica
December 31, 2025 - The abbreviation am stands for ante meridiem, “before midday” in Latin, while pm means post meridiem, or “after midday.” · The concept of a 12-hour clock has been around since ancient times.
W3Schools
w3schools.com › php › php_date.asp
PHP Date and Time
Here are some characters that are commonly used for times: H - 24-hour format of an hour (00 to 23) h - 12-hour format of an hour with leading zeros (01 to 12) i - Minutes with leading zeros (00 to 59) s - Seconds with leading zeros (00 to 59) a - Lowercase am/pm ·
Us
ideas.us.com › blogs › educational-resources › understanding-am-and-pm-meaning-usage-and-time-telling-tips
Understanding AM and PM: Meaning, Usage, and Time-Telling Tips – Ideas
July 1, 2024 - These Latin terms translate to "before midday" and "after midday." The 12-hour clock system uses these abbreviations to distinguish between the morning (a.m.) and afternoon/evening (p.m.) h
Oreate AI
oreateai.com › blog › am-vs-pm-untangling-the-12hour-clocks-little-mysteries › 38c2c4f458f7f280f709efd0e0efd545
AM vs. PM: Untangling the 12-Hour Clock's Little Mysteries - Oreate AI Blog
January 27, 2026 - AM stands for ante meridiem, which translates to 'before midday'. This covers the period from midnight (12:00 am) all the way up to, but not including, noon (11:59 am). PM stands for post meridiem, meaning 'after midday'.
Time Servers
timeservers.net › faq › pm-am-time
What do PM and AM mean?
January 21, 2020 - AM is the time from 00:00 to 12:00; PM - from 12:00 to 00:00. Examples: 1 a.m. refers to the nighttime , and 1 p.m. refers to the daylight time.
Cuemath
cuemath.com › measurement › am-pm
AM and PM - Meaning, Full Form of AM PM | Relation with 24-Hour clock
While AM represents the time from midnight to 11:59 noon, and PM represents the time from 12 noon to 11:59 midnight. The initial 12-hour period which lasts from midnight to noon is designated with AM while the next 12-hour period which lasts from noon to midnight is designated with PM.