hello (used anytime)

こんにちは(haは is used instead of waわthough it is pronounced the same in this word)

ko-n-ni-chi-wa

good morning(used in morning, before 12 usually)

おはよう(ございます when formal)

o-ha-yo-u(go-za-i-ma-su)

good evening(used after 6 ish)

こんばんは(ha is used again)

ko-n-ba-n-wa