What is a proper greeting for nighttime?

i work at a truck stop, and i'll say have a good night/evening until about 2 or 3 am, then i start saying good morning and have a good day.

Good night is used more as a farewell than a greeting. The others may be also, but not so commonly. I would think it a bit odd if someone greeted me with good night! It would be appropriate from about mid-evening onwards.

Good night is a parting phrase anytime until midnight the correct greeting is Good Evening. After midnight it is correct to say Good Morning.

Evening is late afternoon and early night, "good evening" can be used in early night hours like from 7pm to 9pm. It really depends on you look at the times of day and what season is is. "Good Morning" begins after 12:00 am.

well knowing that not everyone goes to bed at the same time a good greeting for nighttime since it gets kinda dark at about 6;30 you could say 'good night ' at 7'00 pm

good morning,starts as you meet in the a.m.,even 2 a.m. good evening is done as a greeting,it is apropreate till you depart company,and then it is good night once you leave

I'd say it's good evening until about the time early risers get up- four o'clock or so?

goodnight

G,nite. ;))