Good question! Since I usually have this one wrong, I'll attempt an answer and wait for somebody to correct me. Good morning : from dawn to midday Good afternoon : from midday to sunset or sixish [that would be around 6:00 pm] Good evening : from sunset [or sixish] to bedtime As I said previously, I often had it wrong.
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TanitGood morning: from dawn to middayThese definitions sound entirely reasonable to me.
Good afternoon: from midday to sunset or sixish [that would be around 6:00 pm]
Good evening: from sunset [or sixish] to bedtime
AnonymousI think till 12 noon is Good Morning
and 12- 4 pm is Good Afternoon
after 4 pm is Good Evening.