Do you say good morning or good afternoon when the time is 12:00 noon
Additionally do you say good evening or good night when the time is 11 pm.

Thank you very much for all ur help in advance

Question

Do you say good morning or good afternoon when the time is 12:00 noon
Additionally do you say good evening or good night when the time is 11 pm.

Thank you very much for all ur help in advance

Answer

after 12pm = good afternoon

(have a) good night = only said when saying goodbye, after 5pm, (but usually only after 9-10pm) - always means "goodbye for the last time tonight, sleep well" etc

good evening = said anytime after 5pm. either for a greeting or for goodbye.

Answer

Technically, speaking Ian is correct but in pratice, we still say good afternoon.  This is because by the time we say it, the exact 12pm is gone. A few microseconds after is still past 12pm.