The end of a sentence always needs a period.
No!
No. You can never have two periods at the end of a sentence. "He will arrive at 6 P.M."
No it isn't. Buses will fly at 7:00PM. Is this sentence correct? [It just needed a period.
it starts at 9 pm and ends at 11 pm
"The students in 1st period today were languid from staying up past 11:00 pm"
PM or p.m. same fro AM or a.m
The time period of morning, denoted by AM or A.M., begins at 12:00 midnight AM and ends at 11:59 A.M. Noon begins PM or P.M.
To determine how many hours are left until school ends, you would need to know the current time and the school's dismissal time. Subtract the current time from the dismissal time to find the remaining hours. For example, if it's currently 2 PM and school ends at 3 PM, there is one hour left until school ends.
PM
12: 59 pm is in the afternoon or daytime. Morning starts around 6:00 am and ends at noon (12:00 pm), whereas the afternoon starts right after noon and ends in the evening.
It ends at 11:05 pm
PM or p.m. same fro AM or a.m