出典:Wiktionary
Earlier call it half a day, first attested in 1838, meaning to leave before the working day was over.
call it a day (三人称単数 現在形 calls it a day, 現在分詞 calling it a day, 過去形および過去分詞形 called it a day)
What do you say calling it a day.
Let's call it a day today.
Its days are numbered.
One's days are numbered.
the livelong day
That day shall come.
日が昇る.
日が沈む.
The days are shortening.
Call me Queen.