PM or p.m. same fro AM or a.m
no period
Since we are talking about acronyms, the proper way to write it would be with capital letters.
Noon is PM, midnight is AM.
either is fine
If they're both on the same date, then they mark a period of 21/2 hours.
1. 4:45 PM 2. A quarter to five 3: fifteen minutes to five
PM or p.m. same fro AM or a.m
Since we are talking about acronyms, the proper way to write it would be with capital letters.
Ur ball sack
4 o'clock because four o'clock isn't the right way to pretension the word.
12:00 pm. or Noon. either way.
If you mean to write it out in letters and words then it's Four thirty pm.(Note that according to some styles, only numbers are used with AM and PM.)
PM
am= ante meridian pm= post meridian
Noon is PM, midnight is AM.
If you mean 6:20 pm, then you could write it in 24-hour-time which would make it 18:20
either is fine
PM represents two Latin words meaning "after mid-day" (post meridiam) Am is after.