Full Form of AM and PM

What is the full form of AM and PM?

Full Form of AM is Ante Meridiem. It represents the time from midnight to noon. (12:00 AM to 11:59 AM). For example: If you say that you have to go to the office at 9 AM, it means 9 O’clock in the morning.

The Full-Form of PM is Post Meridiem.  It represents the time from noon to just before midnight. (12 PM to 11:59 PM). For example: If you say that you have to take dinner at 9 PM, it means 9 O’clock in the night.

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, starting at midnight (a.m.) and noon (p.m.). Noon itself is rarely abbreviated today, but if it is, it is denoted M.

Understand AM and PM Timings :

Clock system
12-hour 24-hour
Midnight (start of day)
12 midnight
12:00 a.m.
00:00
12:01 a.m. 00:01
 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
12:01 p.m. 12:01
 1:00 p.m. 13:00
11:00 p.m. 23:00
11:59 p.m. 23:59

How to Encode AM and PM
In Unicode, there exist symbols for:

“a.m.” U+33C2 ㏂ SQUARE AM (HTML ㏂) and
“p.m.” U+33D8 ㏘ SQUARE PM (HTML ㏘).

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