The date of the ship's arrival is uncertain.

船到的日期未定。

《新英汉大辞典》

That suit was thrown out by Greece's highest court, and construction on the museum is continuing, though a new completion date remains uncertain.

此项诉讼由希腊最高法院庭审，尽管一个新的完工期限还没有确定，但是该博物馆的建造仍在继续。

youdao

His date of birth is uncertain (around 1489).

他的出生日期是不确定的(约1489)。

youdao

To date, no drug has been approved in its leaf form because plants contain a complex composition of compounds with uncertain pharmacologies, metabolisms, side-effect profiles, toxicologies, drug interactions, and no control of relative concentrations.

ECONOMIST: Egypt's challenge