What is the full form of AM and PM?
Full form of AM and PM:
AM and PM both are the acronym stands for the Latin word Ante Meridiem and Post Meridiem. In Latin, meridiem means noon – or midday. Also in Latin, ante means before, and post means after. Both terms are used in 12-hour clock system.
The 12-hour clock is a time convention which divides the 24 hours of the day into two periods.
- AM (short form of Latin word ante meridiem, which specifies the time before midday)
- PM (short form of Latin word post meridiem which specifies the time past midday)
The 24 hours/day cycle starts at midnight (indicated as 12 AM) run through 12 noon (indicated as 12 PM) and the second part of 12 hours start at 12 PM noon to 12 AM midnight.
The 12-hour time convention is used in many European countries,former British colonies, as well as a few other countries.
Example: Suppose, I have to meet a person, I call him and say that I will meet him 7 O’clock. It may be confusing for the person if I have not specified AM or PM to him. He may be confused that if was talking to meet him in 7 O’clock in the morning or 7 O’clock in the evening.
So, to remove this confusion, we use AM and PM.
AM: AM represents time from midnight to noon. (12:00 AM to 11:59 AM). For example: If I say, I have to go to office at 10 AM, it means 10 O’clock in the morning.
PM: PM represents time from noon to just before midnight. (12 PM to 11:59 PM). For example: If I say I have to take dinner at 10 PM, it means 10 O’clock in the night.
Note: We advised not to use the terms 12 a.m. and 12 p.m. because they are not technically correct and often cause confusion also. You can use the term 12 noon instead of 12 pm and 12 midnight instead of 12 am. To avoid the confusion, the airlines and insurance companies use 12:01 am to mark the beginning of an event which begins with the day and 11:59 pm to mark the end of an event which ends with a day.