Usage of greeting: Sir, at 8 am until 10 am is Good morning, am I right?

[Kiki]

Sir, at 8 am until 10 am is Good morning, am i right?

at 10 am until 12 am is still good morning, am i right?

or at 11 am until 12 am is Good day or Good afternoon, which one the true?

and at 12 pm until 3 pm is Good afternoon, is it true?

at 3 pm and 4. 55 is still good afternoon, am i right?

and 5 pm until 8 pm is Good evening, is it true?

and Good night for sleeping or greeting at night is ok to used.

Sir, i hope you can explaine it detaily, cos i really need it sir

Because, i have read some books and they explained different things that make me confuse, so i really believe all of you who get experience in teaching english, i hope you can understand what i need that's why i join this forum

[Jamie (K)]

Native English speakers seldom say "good day" anymore.

We say whichever greeting feels appropriate for the moment.

If I woke up at 1:00 in the afternoon, I might say to someone, "Good morning," or they might say it to me. It's ironic, but we do say it.

Some people say, "Good morning," only after they get out of bed, and then say "hello" or "hi" for the rest of the morning and the entire afternoon and evening. Until I was an adult, I never said, "Good morning," to anyone other than my family, because no one else saw me right after I got out of bed.

Many people day, "Good morning," the first time they see you during the work day, but after the first half-hour or hour they would switch to "hi".

People seldom say, "Good afternoon," or, "Good evening," except in very official situations when they are addressing a group, or when they're imitating a villain from a monster movie or some similar character.

People usually say, "Good night," right before bed time. However, many people also say, "Good night," at 5:00 when they leave work. If someone works the midnight shift at a factory, and he goes to bed at 8:00 in the morning, we say, "Good night," to him then.

[Kiki]

Sir, thank you for your answer, but i told you i am Indonesian and i have side job as english teacher, so if my class started i really want the say greeting to me at the first time come to my class. so i need the detail time to say that greeting not in formal life. i ask you because it is for my english class. I am confuse because i have read book and in those books always explained different. i want get exactly from you. Thank you for your attention but i really need your answer again suitable with i needed