Are these the right translations for the periods of time?

Question

Good morning / buenos días

Good afternoon / buen mediodía

Good evening / buenas tardes

at dawn / al amanecer

in the morning / por la mañana

in the evening / en la tarde

at noon / por la medianoche

at dusk / al atardecer

at nightfall / al anochecer

Answer 1

I am a spanish teacher and some are wrong but here how it would be, all of them (in order):

Buenos días

Buenas tardes

Buenas tardes

al amanecer

de la mañana

de la noche

al mediodía

al atardecer

al anochecer  

Answer 2

In many South American countries you'd hear people saying "por la mañana/tarde/noche."