Prefixing 'good',how to greet &bid farewell to a person when seeing for the first time in AM/Noon/Even/night

Answer 1

Good morning-a.m.
Good afternoon-noon till about 5p.m.
Good evening-5p.m. till leaving
Good bye-leaving anytime
Good night-leaving late at night or going to bed
Good day-is usually a casual greeting on passing
G'day is an Australasian greeting to be used at all times

Answer 2

good morning; good afternoon, and good evening (which is also used for a greeting at night, because the phrase, "good night" is not used as a greeting--it is used when leaving or when going to sleep)

Answer 3

I think good day is a good cover all any time of day.