当日

• 拼音: dāng rì
• 汉字拆解: 当 = that, corresponding; 日 = 日 (sun, day)

含义

That day; the same day; on the day in question. Refers to a specific day already established in context.

Used in formal writing, legal documents, and journalism to refer back to a specific date already mentioned in the narrative. More formal than 当天, which is more colloquial.

例句

1. 合同签订当日，双方代表均在场见证。
2. 事故发生当日，警方迅速封锁了现场并展开调查。
3. 当日抵达的旅客须在指定窗口完成入住登记手续。

用法指南

语境: legal, journalism, official records

语气: neutral

正确说法

• 票务规定显示，当日购票当日有效，不得延期使用。(Ticketing rules state that tickets purchased on that day are valid only on that day and may not be deferred.)
• 当日的会议记录已整理归档，供各部门查阅。(The meeting minutes from that day have been filed and archived for departmental reference.)

错误说法

• 我当日要去 — 当日 refers to a day established in context, not today; use 今天 or 今日 for the current day

起源与历史

当 (that, on that) + 日 (day)

文化背景

世代: All ages

社会背景: Universal