- 第一天 dìyītiān the first daythe initial day of a period or event
- 一天到晚 yītiāndàowǎn all day longfrom morning till night; the whole day; constantly
- 做一天和尚撞一天钟 zuòyītiānhéshangzhuàngyītiānzhōng to just get byto do one's job mechanically or hold a position passively without any initiative or long-term interest
- 当一天和尚撞一天钟 dāngyītiānhéshangzhuàngyītiānzhōng to do one's job mechanicallyliterally translated as "be a monk for a day and strike the bell for a day"; used to describe doing one's job mechanically, or just doing what is required without any initiative or enthusiasm
- 一天星斗 yītiānxīngdǒu starry skya sky full of stars; a star-studded sky
- 罗马不是一天造成的 luómǎbùshìyītiānzàochéngde Rome was not built in a day(proverb) Great things are built over a long period of time and cannot be achieved overnight; often used to encourage patience and persistence.
- 一天一个样 yītiānyīgeyàng to change from day to dayTo change rapidly or look different every single day; to undergo constant transformation
- 最后一天 zuìhòuyītiān final dayThe very last day of a period or event
- 前一天 qiányītiān the day beforethe day before a specific event or day
- 总有一天 zǒngyǒuyìtiān eventuallythere will come a day when; inevitably some day in the future
- 有一天 yǒuyītiān one dayone day in the past or the future; some day
