Practise the thinking. Keep the judgement.
午後 (gogo): Afternoon; p.m.
ごご
gogo
Meaning
Afternoon; p.m.
Two original examples
会議は午後二時からです。
The meeting starts at 2 pm.
午後八時に帰ります。
I will return at 8 pm.
Usage and distinctions
午後 covers times after noon in the am/pm system. 午後八時 is 8 pm, even though English calls it evening, not afternoon. 午前（ごぜん）marks times before noon. State a clock time when ambiguity matters.