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adj.
of or belonging to or active during the day; "diurnal animals are active during the day"; "diurnal flowers are open during the day and closed at night"; "diurnal and nocturnal offices"
adj.
found in the ordinary course of events; "a placid everyday scene"; "it was a routine day"; "there's nothing quite like a real...train conductor to add color to a quotidian commute"- Anita Diamant
adj.
belonging to or active during the night; "nocturnal animals are active at night"; "nocturnal plants have flowers that open at night and close by day"