Full Form of AM is Ante Meridiem meaning before midday and full form of PM is Post Meridiem, meaning after midday (both are from the Latin).
AM and PM are used to differentiate the time in day and night in the 12-hour time zone.
AM: It represents time from midnight to noon. (12:00 AM to 11:59 AM)
PM: It represents time from noon to just before midnight. (12:00 PM to 11:59 PM).
AM and PM are also represented as A.M. and P.M.
Frequently asked questions answered above:
What is full form of AM?
What is full form of PM?
Is there any difference between AM and A.M.?
Is there any difference between PM and P.M.?