HSK 7-9
届时
jièshí
At that time; when the time comes (formal)
Structure
[Specific Time/Event] + ，届时 + [Action/Result]
How it works
‘届时’ is a formal conjunction or adverb used to refer to a specific future time previously mentioned in a sentence or context. It is equivalent to ‘到那个时候’ but is strictly used in formal writing, news reports, or official announcements.
Examples
该会议将于下周二举行，届时请各位准时出席。
Gāi huìyì jiāng yú xià zhōu èr jǔxíng, jièshí qǐng gèwèi zhǔnshí chūxí.
The meeting will be held next Tuesday; at that time, please all attend on time.
展览会于明日开幕，届时将有逾百家企业参展。
Zhǎnlǎn huì yú míngrì kāimù, jièshí jiāng yǒu yú bǎi jiā qǐyè cānzhǎn.
The exhibition opens tomorrow, and when the time comes, more than a hundred companies will participate.
新政策将于下月生效，届时市场环境将有所改善。
Xīn zhèngcè jiāng yú xià yuè shēngxiào, jièshí shìchǎng huánjìng jiāng yǒu suǒ gǎishàn.
The new policy will take effect next month, at which time the market environment will improve.
Common mistakes
Do not use '届时' in casual spoken conversation; using it while chatting with friends will sound overly stiff or robotic.
Tip
Think of '届时' as the formal equivalent of '到时候'. If you are writing a formal invitation or a report, '届时' is the preferred academic choice.
More HSK 7-9 grammar
See 届时 in real Chinese
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