When was that to be?

那会是什么时候呢？

youdao

When did that happen?; When was that?

这是多咱的事?

《新英汉大辞典》

When was that fact true?

这个事实什么时候真过？

youdao

But scientists reported that the evidence was stronger when they combined the results of the four major studies done so far.

VOA: special.2009.08.12

But as he asks at the end, "... / when was that ever a bar / to any watch they keep?"

但他最后问的那句。,哪里什么时候有一个小酒馆/,用来让他们等待？

耶鲁公开课 - 现代诗歌课程节选

I met a man the other day who told me that when he was in high school, he had a pen pal.

前几天我遇到一个人，他告诉我在高中的时候，他有一个笔友。

What if 课堂 - SpeakingMax英语口语达人

General. (Applause.) I had the privilege of meeting this amazing woman at the Women in Military Service Memorial that occurred at Arlington National Cemetery -- when was that?

WHITEHOUSE: The First Lady Celebrates Women in the Military

But when was that door ever closed?

FORBES: Magazine Article

And when was that made?

WHITEHOUSE: Press Briefing