届时 + Clause
The adverb 届时 (jièshí) means "at that time" or "when the time comes," referring to a previously mentioned future point in time. It is a formal expression commonly found in news reports, official announcements, and written Chinese. It typically appears at the beginning of a clause.
会议定于下周五召开,届时请各部门派代表参加。
Huìyì dìng yú xià zhōuwǔ zhàokāi, jièshí qǐng gè bùmén pài dàibiǎo cānjiā.
The meeting is scheduled for next Friday; all departments are asked to send representatives at that time.
新规定将于明年一月实施,届时所有企业必须遵守。
Xīn guīdìng jiāng yú míngnián yī yuè shíshī, jièshí suǒyǒu qǐyè bìxū zūnshǒu.
The new regulations will take effect in January next year; all enterprises must comply at that time.
展览会将在下个月开幕,届时欢迎大家前来参观。
Zhǎnlǎnhuì jiāng zài xià ge yuè kāimù, jièshí huānyíng dàjiā qiánlái cānguān.
The exhibition will open next month; everyone is welcome to come and visit at that time.