It's the end of the day
As a Chinese idiom, Pinyin is f ē nxi ā OD á sh ǔ, which means all night long. It comes from the biography of Xuhe in northern history.
The origin of Idioms
In the biography of Xuhe in the northern history of China, it is said that "Shi Fu talks with Salmonella, or reaches the end of the day, but his heart is not idle."
Idiom usage
Used as an attributive or adverbial; used in writing
It's the end of the day
The army is strong and the general is brave - bīng qiáng àng yǒng
Sharpen one's toes to suit one's needs - xuē zhǐ shì jù