- 出生日期 chūshēngrìqī date of birth
- 国际日期变更线 guójìrìqībiàngēngxiàn International Date LineAn imaginary line on the Earth's surface, roughly following the 180th meridian, where the date changes by one day; also known as [[日界线|日界線|ri4 jie4 xian4]] and in Taiwan as [[国际换日线|國際換日線|guo2 ji4 huan4 ri4 xian4]]
- 失效日期 shīxiàorìqī expiry datethe date on which a document, contract, or identification card expires
- 有效日期 yǒuxiàorìqī effective datethe date on which a contract, policy, or regulation becomes legally valid
