- 日复一日 rìfùyīrì day after day
- 有朝一日 yǒuzhāoyīrì one dayat some point in the future; eventually
- 一日三餐 yīrìsāncān three meals dailyto have three meals a day
- 一日千里 yīrìqiānlǐ rapid progressTo advance at a tremendous pace; rapid progress.
- 一日之计在于晨 yīrìzhījìzàiyúchén morning planningthe success of a day's work depends on a good start in the morning; early morning is the most productive time
- 一日三秋 yīrìsānqiū longingtime passes slowly when missing someone; a single day feels like three years
- 一日之雅 yīrìzhīyǎ casual acquaintanceA brief or superficial friendship; the status of having known someone for only a short period of time.
- 一日不见，如隔三秋 yīrìbùjiàn, rúgésānqiū missing dearlyone day apart seems like three years
- 一日为师，终身为父 yīrìwéishī, zhōngshēnwéifù teacher as fatherteacher for one day, father forever; students should have deep respect and lifelong gratitude for their teachers
- 一日不如一日 yīrìbùrúyīrì deterioratingto be getting worse by the day
- 非一日之功 fēiyīrìzhīgōng long-term effortrequiring a long period of time and sustained effort to accomplish; not achieved overnight
- 冰冻三尺，非一日之寒 bīngdòngsānchǐ, fēiyīrìzhīhán gradual accumulationThree feet of ice does not form in a single day; a situation (often a negative one) develops over a long period of time.
