这个问题有意思。它们尽管没有具体所指,但还是有一定共识的:
Morning: 5 am to 12 pm (noon)
Early morning:5 to 8 am
Late morning:11 am to 12 pm
Afternoon:12 pm to 5 pm
Early afternoon: 1 to 3 pm
Late afternoon:4 to 5 pm
Evening: 5 pm to 10 pm
Early evening:5 to 7 pm
Late evening:9 to 10 pm