Parts of the day
From Teflpedia
Parts of the day in English form a sequence; morning, afternoon and evening.
English speakers use a salutation appropriate to the time of day; good morning, good afternoon, good evening.
These may be split into early, mid-and late, i.e. early morning, mid-morning, late morning, early afternoon, mid-afternoon, late afternoon, early afternoon, mid-evening, late evening.
We use the preposition in as a preposition of time to refer to these.