(1)All night long: 整夜

Some stores stay open all night long.

　　(2)Call it a day: 一天工作完毕

Every day, we have class from 9am and will call it a day at 4.30pm.

　　(3)Day after day: 每天

Schooling could be very boring, as the students do the same things day after day.

　　(4)Day in day out: 一天又一天

Henry wears the same old jeans day in day out. Isn't he going to buy some new clothes ?

　　(5)For a rainy day: 为困难的日子作准备

When a person gets older, he will realise the importance of saving for a rainy day.

　　(6)In this day and age: 在现在这时代

In this day and age, no one can expect to get something out of nothing.

　　(7)Have an off day: 不大成功或顺利的一天

Tom did not do well in yesterday's test.He considered him unlucky euough to have an off day.

　　(8)The order of the day: 一般的惯例

In a petroleum station here, payment by credit card is the order of the day.

　　(9)The other day: 几天前

I bumped into an old friend the other day.

　　(10)To this day: （指日期）准确地

It is 40 years to this day that I left university.

　　(11)Have seen better days: 曾经历过好日子

Palmer was departmental head in that university before he came here. He has seen better days.

　　(12)Some day: 将来

Everyone hopes to be great some day.

　　(13)One's days are numbered: 末日将临：

Under computerisation, unskilled workers become redundant. Their days in a company are numbered.

　　(14)Carry the day: 胜利的一天

Our team lost at first, but later, it carried the day with two goals to one.

　　(15)Someone's day: 幸运的一天

Jim was promoted. Furthermore, he was given a performance bonus yesterday. It was his day.

　　(16)Take a day off: 休息一天

Janet was unwell and took a day off.

　　(17)Have a night out: 夜间出去消遣

It's time to have a change. We must have a night out at the weekend.

　　(18)A night owl: 迟迟不睡者

The moment Jack entered the university, he was a night owl.

　　(19)At the dead of night: 深夜

Our managerial officers attended the emergency meeting at the dead of night.

　　(20) Save the day: 使情况变佳.

Frank saved the day by kicking in a goal during the last five minutes of the match.

　　(21)Every dog has its day: 凡人都有得意日

I have seen ordinary people suddenly become important. This is a case of every dog has its day.

　　(22)What is done by night appears by day: 若要人不知，除非己莫为”Crime does not pay. Criminals will be found out. That's why we say : What is done by night appears by day.